Crime of misappropriating public funds: If the buyer fails to pay all the final payment as agreed in the contract, but still transfers the property and applies for a mortgage loan, then this part of the money may be regarded as "public funds". If the buyer deliberately uses this part of the money for other purposes, it may constitute a crime of embezzlement. This crime involves Article 266 of the Criminal Law, and the specific punishment depends on the amount involved.
Crime of forging seals and certificates: if the buyer forges the seller's signature to handle the formalities of house transfer and mortgage loan, it may involve the crime of forging seals and certificates. This crime involves Article 267 of the Criminal Law, and the specific punishment depends on the nature and quantity of forged documents.
Fraud: If the buyer obtains the house title certificate and other documents that prove the seller's wishes by deception, and then transfers the ownership and goes through the mortgage formalities on this basis, it may constitute fraud. This crime involves Article 266 of the Criminal Law, and the specific punishment depends on the amount involved.
It should be noted that the specific charges and penalties need to be determined according to the specific circumstances of the case, so if you want to know more details, it is recommended to consult relevant legal professionals.