Opening a PDF file on your browser instead of a dedicated reader may also result in the corruption of the file. But, Nowadays, when you open the links in apps like Instagram, Facebook, and Twitter, they open those blogs/websites within the app. From there, we can surf and go through the details.
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If you download pdfs occasionally, you can use the context menu to open it in your default. Open with system viewer - loads the file in the default program for pdf files.
Catch here is that Pdf plugin for Dolphin browser use Google Docs to read and open the PDF files. Click on the PDF link now, the file should in the same browser instance.