While viewing the PDF online, click at the end of the URL for the page in the Address bar of the browser. Back up to delete the document name and any other additional text after the domain of the site (possible domains are .edu, .com, .net, .org). Then, press the ENTER key on your keyboard to load the site.
For example, for the URL http://www.cahs-pets.org/programs/art/CAHS_ALE_Brochure1.pdf, the web site address is www.cahs-pets.org. If you go to this URL, you should be able to find more information about the article or document. (See below.)