Dear Mr Ram,
Do you want to encourage corruption by acceeding to the request of Statutory Authorities. If you are complying with all the statutory provisions in your premises, you need not bother about him. In case of any non-compliances bring it to the notice of your management and take appropriate corrective measures, which may cost you less than accommodating the request of ADF. 100% statutory compliance is better than favouring statutory authorites.
You send a mail to ADF stating that the person referred by him has been interviewed and he can be engaged for post and salry as per your company's policy. You can also send an offer letter to the candidate parallaly. In case the candidate rejects the offer, you can also communicate to ADF.
In case he replies, preserve as a document for seeking favour from you, which can be used against him at a later date, if he creates any problem. However, before resorting to this you keep your top management posted of this and proceed.