Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1f4be9237e50fa…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 05:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb12090b2738adb286a53c16d95e9d82 SHA-1: 5ba2c616f70c3f497e6637bc01b6a2809846de19 SHA-256: 6a1f4be9237e50fae21433688b28a0837f6a017472487a0d444742c5cf7d9e7b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, likely to manipulate search engine results or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fese.in/ienupdimages/images/files/kupexifivurobefib.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac0696226---13799696112.pdfIn PDF document text
    • https://reha.bg/content/upload/file/leruxufabosolopesokotov.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/furunadi.pdfIn PDF document text
    • http://pvvc.cz/files/39478438878.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/89613ac7b400e90164fba884c57b86c9/94175724680.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/73a413385854c2f892183e93b705743e/tozije.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/6ce4bc45e32e020229e64d813bb1409e/pazewevukunesijiv.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/33833075817.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/88289660016.pdfIn PDF document text
    • https://birotex.rs/images/files/mufunokili.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/96713338454.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ev0ks5mf11a7f8osqfg6v36rkh/42829754667.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/xikizifogarewewe.pdfIn PDF document text
    • http://www.77ice.com/upload/files/fujine.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1a5318ba19351524ffdf07d8cd68313c/nimalexokurexi.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/pakikomuwilumofeleba.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/resatekunabumikixul.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/kapefenamibema.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5a6e42dd---rixame.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/85942698837.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f45586783---naravedevuxawapazatode.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/72832310140.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/95500878826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tony+hawk+underground+2+cheats+perfect+manualPDF 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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 11448 bytes
SHA-256: 0b39a52ba0aa4082eac0aeb6d0531441271893e266f33ea30a8a8e4a97d21a7c
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 18152 bytes
SHA-256: af9f4e08edcaf67866c5b43f264ceb98c23d4f2357180b2a56015808c605c477

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