Malicious PDF — malware analysis report

Static analysis result for SHA-256 8210fb55cde1c76d…

MALICIOUS

PDF

63.7 KB Created: 2021-05-16 03:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 363af2f8e486a70b67f5c7a75b9daa5c SHA-1: 0f223db122b94006a37a4036643c7bf47acd8155 SHA-256: 8210fb55cde1c76d159f9db19e8b43f316fe7fe43e4136234c0cce0deb773ebf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071104b9ac70---vokamiredukoto.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb67acb6a---95835352603.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/soucdk69k23sa3k5inf80fkdml/dabixubo.pdf
    • http://aryajob.com/user_upload/file/kotudexugu.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9ac89fa9---sumutikazibonuregi.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4bbd1480e25718bfddb5f21c99aa1f48/34436419179.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fce97f6fc---bevexem.pdf
    • https://gbagencement.fr/uploads/file/81345637240.pdf
    • https://angelsstaff.com/uploads/file/dezufofujegenefov.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f6815806---43603629777.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/032d12cef5f3936ee4dc3de095d8eff1/zodevega.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987f526fc81---54561006252.pdf
    • http://jarosi.hu/files/file/jafal.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3b1adc0e6---18057818294.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1113f15e---suvozadesuve.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d9fb7e082eab8da605d50718da36bc41/85068256987.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wordscapes+answers+level+1044
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc5.bin
157d1495d6b27617fa17268c204dd960f6c1598aa5128ef7774d7530a17f2c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 5516 bytes

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