Please let me know if this Du'a or Dhikr is authentic or not. I heard that to strengthen oneself by wealth or to get good job one can read this Du'a repeatedly. That Du'a is: "Lailaha Illallahul Malikul Haqqul Mubeen, Mohammedur Rasoolullahi Sadiqul Wa'dul Ameen". Please tell how far this is correct or how far this Du'a is authentic.

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions. Al-Hafidh-al-Iraqi in his book: 'Takhreej li Ihya al-Uloom' said, The Hadith is reported from al-Mustaghfiri . Al-Khateeb said, One of the narrators of the chain is al-Fadal Bin Ghanam , who is weak. Abu Nuaim also mentioned it in 'al-Hilyah' and said, Saleem al-Khwass is in this chain, I think it is the saying of Ali ( Radiya Allahu Anhu). However, the Hadith is weak. Allah knows best.