This whitepaper describes a new technique for generating large WPA-PSK tables to be used for cracking wireless networks. The concept involves injecting malicious Javascript code to a large websites and forcing user browsers to fetch data from attacker’s server, compute PBKDF2 hash and send it back. In some conditions this can lead to creation of a large, parasitic, distributed network used for effective hash computing.
You can download it from the following link: https://packetstormsecurity.com/files/download/75221/parasitic_wpa_cracking.pdf
Source: https://packetstormsecurity.com/files/75221/Parasitic-Approach-To-Cracking-WPA-Passwords.html