He said many of those she'd let through the doors were now doctors, civil engineers, lawyers, police officers, nurses and architects.
"Professions none of us could ever have hoped to achieve in Afghanistan."
He said Ms Clark was brave and showed courage and compassion at a time when there was deep suspicion about Muslims.
"This makes me sure she is a person who has the right leadership qualities and the right sense of social justice and compassion to lead the UN."
Ms Clark tweeted in response.
"In 2001 as #NZ PM, I led a decision to accept #Afghanistan refugees, I am deeply touched by this story."
New Zealand's Ambassador to the European Union, David Taylor, said in a tweet Mr Hazaranejad's tale pointed out two key qualities that were important for the next leader of the United Nations.
"In a world struggling w/ #refugee & #conflict issues, this story points 2 qualities important 4 next #UNSG @Helen4SG."
Meanwhile a new poll has found more Australians are favouring New Zealand's candidate for the top job over one of their own.
The Sydney Morning Herald reported the country's former Prime Minister Kevin Rudd, who has not made his candidacy official, did not have the people's backing.
The Essential poll, released yesterday, has indicated that 45 per cent of the 1020 surveyed thought Ms Clark would be a better leader of the United Nations. Only 21 per cent backed Mr Rudd.
Thirty-four per cent were unsure who would make a better leader.
Mr Rudd had recently been reported saying the Eastern European candidate was the most likely to be chosen to replace Mr Ban Ki-moon as Secretary-General.
