Reading your question again I think I didn't understand it correctly. If you want
wget to recursively download all PDFs linked on https://www.zeewolde.nl/gemeente/formulieren-pdf_42836/, you need to tell it with the
--recursive) flag in addition to the max depth. Additionally, if you want
wget to figure out the actual filenames, you can use the experimental
--content-disposition option. So the command would be:
wget --recursive --level=1 --content-disposition "https://www.zeewolde.nl/gemeente/formulieren-pdf_42836/"
Note that while you can specify file extensions to be downloaded using the
--accept option, you'd have to additionally accept
php to make
wget download the files in the first place. That will, however, download every
php file. It's probably easier to just download everything and manually delete the files you're not interested in.
You probably didn't enclose the URL in quotes.
The links on the website you provided contain multiple Http GET parameters which are separated with
& characters. Those will be interpreted by the shell if you don't escape them. The easiest way to do so is enclosing the whole url in quotes: