This is a common malware (Jul/Aug/ 2012). Some variations include "flashplayer.php" and a few other names. Some of the domains distributing malware:
http://lig-limp.com.br/rebots.php http://hroil.com.br/old/rebots.php http://smuss.net/rebots.php .. many others ..
Affecting: Any web site (most common on WordPress).
Clean up: Malware is hidden at the index.php or index.html files.
Last update: 2013/Jun