Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a16c0b229161e58…

MALICIOUS

PDF

82.4 KB Created: 2021-07-05 00:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 555888d4e702029b07b1711a7807c27d SHA-1: ff455a64d4579bb57a127b1c1a99179f9daf8191 SHA-256: 9a16c0b229161e58930c647de2e07d2ec2c1a6670901cdc6a4303de39ea2b5dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests the document is designed to lure users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://crysiq.ru/uplcv?utm_term=constitution+trivia+questions+and+answers
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c312403380d---rakajepujewom.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0db47e7f4---gidukufa.pdf
    • http://al-bandak.com/userfiles/file/50884468279.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84fe9b0177---furorepazunisabobalowe.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609920c3288ad---mepuzefevojunumamozuxov.pdf
    • https://guruamardaspublicschool.com/userfiles/files/fexivebubarenuka.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2b62da25ee7fce111087a20ee7e68b60/wenafiromomajedeb.pdf
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/93733249647.pdf
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/sexetunuduvaruribo.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2472917d6364fef0372c60d290a7a81f/32622300804.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/3e1d63fff148c930cd7ed4a89a621435/rezosimunukamirexexe.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/40e61bf0b89128e567ad1f997a7ee96f/vebedadufuweno.pdf
    • http://www.euro-fly.eu/userfiles/files/92312510536.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1d95ea000f7f65832f1e18bf4a8f566/jonemo.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/97ea149b47f30895d6e70e9862282777/49737661416.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607404b25f59a---lupukivasebuzip.pdf
    • https://acgroupenterprise.com/userfiles/file/16128987539.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/bubutexav.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fe512542c2c8819f02834b7a11f61f6d/73251213738.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/d5617db634a9ad57d48a88a2b0291c1d/wejemorofebirosek.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce1ca1359---delelinozumasedikoxaz.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1b406314ea3cd8ff389eeb9cee6fb4d8/kupasarimij.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/0a73c8c80be381af3e3d350095e52187/18108032398.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/wigolumiwukoledekabozoxot.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2322cdec3bfd27dd0351b42bf840345f/mewuvazugovaxefosifotuk.pdf
    • http://sahrugs.com/userfiles/file/dulefobibob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf2.bin
f93350c8be2797af15a72dd259b548acdecf6489fbba6809feb906082d4d5b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 17476 bytes
font_01_sfnt_off00010b6e.bin
f57352a098b42a60ac02e95c132c756c6f38f9514e11f33e66397dbfa137c5af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 10624 bytes
font_02_sfnt_off000123c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16792 bytes

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