Search Engine Optimization (SEO) poisoning

It is not uncommon for social engineers to build a website around frequently used internet search terms in order to lure users into performing an action, such as downloading a trojan or divulging their credit card numbers. For example, a user might enter a computer error message into a search engine only to come across a downloadable “fix” on the first page of the search results. The software might be a trojan or rogue anti-virus software. See also reverse social engineering.