Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc21d92859fb44a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 07:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7a18c91ec15ffc036a333a88ad3aef9 SHA-1: 447e9f1c0b1e5ac7012b1c7eb18d1282bac04504 SHA-256: dfc21d92859fb44a3eadaf7614e8ab483a419fe2440f9cbddc9d15b30a838348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fd97114e77d6e990e5168c928ce4746b/bomewerepeb.pdf In PDF document text
    • http://www.themixchange.com/userfiles/files/57136780395.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0eb27b52---61648588995.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/33504077080.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/164b5524a9ba3d0e9c39874903ba4ba1/konesivagusewavapapebiw.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/eb1c6887bb471fc6d73fe6aad86222eb/11528718016.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lm47q7pnsgfugm0kgqlc19b344/musifuvobodulebu.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/56207768539.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d87a81e14c---xepivivupugelovolid.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210612102811.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e2791e79---gagifedamejabutirokaxu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66c340ba5---fedepopesajunisid.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2816ccdea---bijudadaxudaboz.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/16737830275.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/xivafobulunu.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/55543654663.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/d83l0f3l2ugck3mttaq3do76k9/vetirupevifa.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/tolor.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21d9b6167---wejafepuvokekizoj.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/novizovurogumubonitiju.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/sawigimivatezelot.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082858e4dde9---91128410511.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c550baef8---25270169607.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/tawetesik.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ovsi6k590ej4qtfql6ohfkhnup/6640543956.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/q54e69alsg26v7h6cfm81hpkm4/72625019152.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160db0f870a9f6---57741091070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=difference+between+geometric+and+arithmetic+sequencePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AC 11348 bytes
SHA-256: 830eec161d0153bda2359e05ce4234cc24f4492800608a3bdf0aff9624a9fe6f
font_01_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 16264 bytes
SHA-256: ced8fa58413204b78c97355b4cc8061c990dae03ccaa12c5fd0a5bc888466440
font_02_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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