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It should not be too dificult to add a hyperlink on an image, or banner. As long as it is an image which is placed in for example a folder summary, description or body of an article, you can use the "Insert/edit link" button on the WYSIWYG editor to apply a hyperlink on the image/banner.
So you add the image first, with the "Insert/edit image" button. You then select that image and use the "Insert/edit link" button and once the "New <link> tag" popup appears make sure to select Http: for the Href option and enter your url you want to link the image to. This can of course be a file like a pdf document.