I found out what's happening, I did not sign the app because I'm not a company and since I'm not a company I don't have a trusted signature (actually I don't have a signature certificate at all), that's why virustotal.com detects it as a malware.
Here is the link of the scan. Only 1 out of 56 anti-viruses has detected the app as being malware. So far, I can definitely and strongly say that it was a false detection and in support of this statement check the major anti-virus companies detections (such as BitDefender, Avast, AVG, etc.).
Don't mind the part that with app signing, I thought that was the problem, but it wasn't, though not signing an app could cause a false positive.