Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c40dd68f455269a…

MALICIOUS

PDF

73.0 KB Created: 2021-06-18 23:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4010156978891c6ddc1a7b885346364b SHA-1: 857661b77bc77771183dd58cc011bcbd9e71cbfd SHA-256: 4c40dd68f455269a2987e3f41c3e8fd36754995824842503caa5149262d8fa19
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://archerelectricsupply.com/userfiles/file/kibulejinubenomozukovi.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbes7vjl23093ok1a5dskchefa/47117765625.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997ff140ff8---47791248578.pdfIn PDF document text
    • http://vo23.ru/upload/file/17227409918.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4c67c89a---bazutebesobozemoro.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/lotulijozomonifo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331e98eb49---nadaxofujoz.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/aghdj3460jdgvjomjqbb3h4984/fujarifezidatozer.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/705865ca6246a983d1de46435bc02295/95727143630.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/39168389479.pdfIn PDF document text
    • https://ksboutlet.com/file/files/vipularelurupamegatafab.pdfIn PDF document text
    • http://gtshotel.it/images/file/duberufijuwukop.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39b0b384e---27676040402.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f8d1957d91399297ac0db0abdf4a6eb6/wokob.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xutewefatorijizigepuna.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2885a97644---bagomuzoxefiluvom.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/adcd3ff97ba80d1fc60cedfa3ee16551/ruvotuvugureninovem.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8abb480f6---85593357225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=video+player+pc+windows+7PDF 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 5308 bytes
SHA-256: 1dc10f3c4334af486fdf2dd0453373a5822a1b05339bb6e8ea6eef1b39eaae99
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10788 bytes
SHA-256: 36321fbdfaf7725fca4ea8d0520725d4630e5899d2609e8f0e99da403001d7b2

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