The download of the app doesn't contain viruses or any kind of malware. Hzj_jie is the creator of Wallpaper changer that can be found in the Tools category. Over 10 users downloaded and installed this application and the most recent release was on December 14, 2016.
You are able to download the installer of Wallpaper changer 1.0 for free and have a look at users' reviews on Droid Informer. The app works fine on Android 2.0 and higher.