George Emad <engr.ge...@gmail.com> writes:

> Thanks for your suggestion will try to analyze the problem with
> wkhtmltopdf tho and open a issue on their repo instead of pandoc
> then.

This appears to be a known issue:
https://github.com/wkhtmltopdf/wkhtmltopdf/issues/2153

The man page on Ubuntu also contains this:

> ## Reduced Functionality
>
> This version of wkhtmltopdf has been compiled against a version of QT
> without the wkhtmltopdf patches. Therefore some features are missing,
> if you need these features please use the static version.
>
> Currently the list of features only supported with patch QT includes:
>
> [...]
> * Adding links in the generated PDF file.

You could try to download an official binary from here:
https://github.com/wkhtmltopdf/packaging/releases/0.12.6-1


--
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe e836 388d c0b2 1f63 1124