Originally published at htpbe.tech . The version on htpbe.tech stays in sync with the latest detection algorithm — refer to it for the canonical text. Invoice fraud is one of the fastest-growing cybercrimes targeting businesses today. According to the FBI Internet Crime Complaint Center , business email compromise (BEC) attacks — which often involve modified invoice PDFs — resulted in losses exceeding $2.7 billion in 2022 alone. These attacks are sophisticated, targeted, and devastatingly effective. The attack is simpler than it appears: criminals intercept legitimate invoices, modify the PDF to change bank account details, and send the fraudulent version to accounts payable departments. The result? Payments intended for legitimate vendors end up in criminal bank accounts, often never to be recovered. The same technique scales to contracts: in contract fraud , payment terms and bank details are changed after signing — often with higher per-incident losses because the underlying deal value is larger.…