Testing those URLs for errors or timing differences that indicate a vulnerability. Exploitation:
SQLi Dumper is a tool primarily designed to automate SQL injection attacks against websites. Using it against any site without explicit permission is illegal in most jurisdictions (Computer Fraud and Abuse Act in the US, similar laws globally). Distributing or facilitating access to such tools for unauthorized use violates ethical guidelines. sqli dumper v8 0 download link top
For those interested in learning database security or performing authorized penetration tests, reputable alternatives and resources include: PortSwigger (Burp Suite) SQLi Dumper v8