As a part of its ongoing Hacker Intelligence Initiative, Imperva’s Application Defense Center (ADC) observed and categorized attacks across 30 applications as well as onion router (TOR) traffic, monitoring more than 10 million individual attacks targeted at web applications over a period of six months. This report discusses and analyzes their findings.
You can download it from the following link: https://packetstormsecurity.com/files/download/103456/HII_Web_Application_Attack_Report_Ed1.pdf
Source: https://packetstormsecurity.com/files/103456/Impervas-Web-Application-Attack-Report-July-2011.html