Malicious PDF — malware analysis report

Static analysis result for SHA-256 f406f90b8ebefebb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 06:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17f1183e842caeffa387cf7c4bd2831e SHA-1: 3ae2ba929f4f4a9e316850e3f638c3dfc4a0f6ed SHA-256: f406f90b8ebefebb648edd165e87b7a812246d67fe7d2918e5cb4e8274ca6dd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://montoaneli.com/ckfinder/files/kepixukul.pdf In PDF document text
    • http://short-story.ru/upload/file/gulogamonovi.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/gowamisakejubadoxonasiron.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec589bcfb9---wevotaxiwani.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/86337707064.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/39670487730.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/meginejeputesezasi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/2bnoh9ihtm1gqhbegqtlet6660/rawilojibarimiboxodid.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/pasutazavuk.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/67159190842.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/46205266748.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/taverutaxinofobata.pdfIn PDF document text
    • http://1carl.com/userfiles/file/7318592167.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/42040421898.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/76680875673.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/31950502052.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/47939996511.pdfIn PDF document text
    • http://usateatop.com/_upload/files/xizenuxug.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/juxorebisitajen.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d73ad046e---8879314415.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613978154a167---lujovutamejumapo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a0e42be3e831e5fc13c71f8639e15d0a/xobebabugizexige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=aptitude+question+and+answers+in+sinhala+pdf+free+downloadPDF 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_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 17372 bytes
SHA-256: 0a9745185ba57d944c702ef6250576d5a778800fa4a64be9b3c742d6e0f82244
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10908 bytes
SHA-256: eb84ba97164ae43737484257f0b8c9cc068d6a32731c0d817a9210423b4a2a4a
font_02_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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