...
    new_page_func => sub {
        my $url = qq{ http://www.somewhere.com};

        my $next_page = $pdf->page();
        $next_page->mediabox(792,612);

        my $annot = $next_page->annotation();  # an annotation is a component of a page
        $annot->url($url,-rect =>[100,50,310,30],-border =>[1,1,1]);
    },
    ...