We can use Google for passive information gathering purposes. This method is a passive one, the target site doesn't know about our reconnaissance. The Google search engine provides a decent set of special directives for refining the search results to suit our needs. The directives are in the following format:
These directives can be very profitable for searching juicy resources for a target. As an example, let's do an advanced Google search on
packtpub.com that will list all indexed PDF files:
In this advanced search, we utilized the
directive to only obtain files ending with ...