Greetings Ruben,
I have no idea. The SQL report comes from Apache server data. So I only have the location and referer information. I assume as many referer URL's are getting 404 hits to that graphic, that it is appearing in random photo spots on webpages throughout the UBB portion of the site.
I also have no idea what large/original graphic it is to be a thumbnail of. I have not done my SQL sleuthing through the UBB DB yet.
I am thankful,
Michael