Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d25b6bbb5232ff9…

MALICIOUS

PDF

68.1 KB Created: 2021-06-02 17:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bef3eb8f59956e68dd44d4522bd811f0 SHA-1: bc542cfb9a9218ae1211ea6b785505d3b76fffcc SHA-256: 8d25b6bbb5232ff981a1f64397be5be90fc4f0d33accb87cb5d9beb19d92f4a6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9816

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 http://angelojrobles.com/admin_initial_test/userfiles/file/31646383067.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7a82f6ce---84865313737.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/806f9928dc6e79e410be573f5af9384c/bukezurepatowove.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5ec117ad02eb0f700e8b846754776149/31469863427.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/01d0fa496326cd6e031ba56de86b6b53/rikagasod.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9fe8fd0ee1cb8db9fc25842524cc217a/58156463930.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc77b5bf2---25514388242.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/8hq8ddg8vvmn3nctd9uue292qd/xudezutigewi.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea122a802---risamerivamumututinidofom.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5a6151e44551344a5a1da06441426334/gapulemobev.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cedb2d2ed---97611711443.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa8d5bd2d---92938361736.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7b6e09ee---fadivibasuvuw.pdf
    • https://butchercurnow.com/img/shop//contents/jikezeramevabig.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608664a7b533b---72866959372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=are+any+gyms+open+near+me
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d760.bin
19398e7d0e692e45f91296ca71e12ea20b8777b3e9fa1e292c8d14fab1445785		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 5196 bytes
font_01_sfnt_off0000e907.bin
a05a417d3aa4504893531e89cc9570039f61d012b7bcade8672a802ed48505ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 10176 bytes

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