Malicious PDF — malware analysis report

Static analysis result for SHA-256 226f43d4b33a4ac5…

MALICIOUS

PDF

73.6 KB Created: 2021-06-05 09:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5749a94d219fc17f547f2ce9972077b SHA-1: 9ab2b9c74b62a941c81662de4b066abc2f059a8a SHA-256: 226f43d4b33a4ac52a88f9febf1916ffc6e371b2106a503b5247322d7d4f18b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically an 'Amoeba sisters' worksheet answer key. The presence of multiple distinct hosts and the use of UTM parameters indicate a link farm designed to redirect users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8799

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 https://infrive.ru/uplcv?utm_term=amoeba+sisters+dna+chromosomes+genes+and+traits+worksheet+answer+key
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c62105c4559a736e4097e3e45f9c4124/wupidoxuvedalobozomajum.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/48bf1c65cf44cbb1dc5f8e9dc7c5eaea/64313411312.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/qi8nlsjvarbfpcbjbt00cdrt2p/16176694655.pdf
    • https://yellowstonewildlife.com/tefekopuvetixuv.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608156751fa88---73216254739.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r62pbqu4ioctc43gpkvdth0t1p/femugejoriw.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/02f5e74e32a0c5d7231b96d281fa97d4/11507707207.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/o2ggjt05u1e309d3jdfii2atef/debagiwixarer.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72c003772---58683411017.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8ebeaa7f---dibexij.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8f9d8cb503bf5179d482ba301bec951a/85378554386.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1d0bec2148f9b611c644bbd9f20c846d/26013353992.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8688232e0---tupibamifimikezadovodag.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e36fc5adb8c601dcbe29b1369b34c5b2/71029023615.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7c.bin
a6eb2ad6aa7629d010b84f06fc09c03c838cb1722ff0c32c6ea1f8c5c866ef12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 5708 bytes

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