conversion printing app from landscape to portrait mode
One of the best apps for your (=my) aimis the app "Samsung Mobile Print".


Select 2 Up
Print it to your android device (use Google Cloud_Printer)
Wait a couple of minutes until your android device will download the new document (unfortunately this solutions converts colors to black/white, but for me it's okay)
Send the downloaded PDF to a normal Google-Cloud-Print or Remote-Print-App!


That's it!