What is the legal ruling on owning money for which documents were forged to prove partnership and inheritance, knowing that the money is now legally in the account and recognized by the bank, and there is no claimant to it after its owner died in a plane crash?

Whoever leaves behind wealth, it belongs to their heirs, and it must be delivered to them if they can be identified. If not, it must be given in charity with the intention of reward for its Muslim owner, or with the intention of discharging the right of a non-believing individual. It is not permissible for the questioner to benefit from this wealth. If the forgery occurred with his knowledge, he must repent and return the wealth to the heirs or dispose of it through charity.