The search query is ubiquitous in the engineering community for several reasons:
Standards are living documents. They are updated, revised, and sometimes withdrawn. A "free" PDF found on a random file-sharing site might be an outdated version (e.g., a 2000 edition when the 2019 update is current). Using outdated acceptance criteria can lead to rejecting good welds or, worse, accepting bad ones, which poses safety risks.
Instead of risking legal trouble or malware, here are legitimate sources for ISO 10042: