Based on the facts stated by you, there is generally no need to panic. Merely sharing a coloured PDF copy of a registered sale deed on WhatsApp does not by itself enable someone to transfer your property or create valid ownership rights.
A sale deed is evidence of ownership, but ownership of immovable property cannot ordinarily be transferred merely on the basis of a PDF copy. Any valid transfer would require execution of a fresh registered conveyance by the owner or a duly authorised person, along with compliance with the applicable registration laws.
That said, like any identity or property document, a copy of a sale deed could potentially be misused for limited purposes, such as:
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Attempting to create forged documents.
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Using the property details for fraudulent representations.
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Misusing personal information contained in the document.
However, such misuse would itself be illegal and would not automatically affect your ownership of the property.
The fact that the original sale deed is lying with the bank is an additional safeguard. Since the property is mortgaged, any genuine purchaser or lender would ordinarily require details relating to the original title documents and the existing encumbrance before proceeding with any transaction.
If you are unsure whether you actually sent the PDF, you may simply check your WhatsApp chat history or the "Media, Links & Docs" section of the relevant conversation. There is no need to assume that it was sent if you are uncertain.
If you later discover that the PDF was accidentally shared with an unknown or suspicious person, you may:
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Preserve the chat for your records.
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Monitor the property records periodically for any unauthorized activity.
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Keep the bank informed if you notice any suspicious developments.
On the facts stated by you, sharing a coloured PDF of the sale deed by mistake does not, by itself, place your ownership or the bank's security interest at risk.
Since you mentioned that you suffer from OCD and memory-related doubts, it is also worth remembering that such conditions can sometimes cause persistent uncertainty about whether an event actually occurred. If you cannot find any evidence that the document was sent, it would be prudent not to assume that it was. Instead, rely on objective records such as your WhatsApp chat history rather than your recollection alone.