Webmasters Stack Exchange is a question and answer site for pro webmasters. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Possible Duplicate:
Strange spam posts not making sense

I've many sites online and regularly I get the following type of spam text through "contact us" form even when containing Captchas. What could be the motive of sending such garbage? :

Submitted on Tuesday, October 11, 2011 - 10:43 Submitted by anonymous user: [] Submitted values are:

Your Name: vlgktopsy Email-id: xoqvxh@hdqsrh.com Subject: QQLBMucIxgHjkAZxE Comments/Questions/Feedback: BqjVXf ujfyjtshjwos, [url=http://hwnjbrwibfme.com/]hwnjbrwibfme[/url], [link=http://rsxwknbdppsi.com/]rsxwknbdppsi[/link], http://tpbftnbgarqv.com/

share|improve this question

marked as duplicate by Su', paulmorriss, danlefree Oct 11 '11 at 9:26

This question was marked as an exact duplicate of an existing question.

Thanks. Yes indeed it is exact duplicate of it. Unfortunately nobody could answer the motive of such attacks. – AgA Oct 11 '11 at 7:00
up vote 0 down vote accepted

Usually, this kind of behavior can be explained in two ways:

First, it can be a test to discover vulnerabilities of your site, your application or your server. Forms can be really dangerous, they can open the door to your software or your server configuration. Several attacks try to guess whether your system is vulnerable by sending you requests including malicious code or strings.

But in your case, because I can see several [URL= strings, chances are the reason is pure SPAM. This is the typical spam request that is sent to forum, blog and guestbook modules.

In fact, the [URL= string is part of BB code, a common markup language used in blogs and forums used to post URLs. Spammers performs a high number of post request including URLs to generate back-links to their websites or to their clients' websites.

Chances are your contact form has been flagged as a kind of forum or blog.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.