Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6e5759902f657b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 06:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67a442056511328a2bb34d3565059f8b SHA-1: 351ea9aafae25ddbed610de51ac17734ab6bf6fc SHA-256: 4b6e5759902f657bf475423ac4af3959c355859b2cc9a3b7086d4a45624ae122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The primary attack pattern observed is the use of these links to redirect users, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=nicki+minaj+the+empire+mod+apk
    • http://huynhgiabaohotel.com/uploads/FCK/file/35526181312.pdf
    • http://abwva.com/uploads/files/jinomovubixagaburom.pdf
    • https://ustunbilgisayar.com/userfiles/files/16976670373.pdf
    • https://mbbs.hr/files/50690775799.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/192bb7b9249c9d02fc3cacb959443084/bojovofuxe.pdf
    • http://theheavent.com/userfiles/files/65312967691.pdf
    • http://liqaa-lb.com/files/userfiles/files/tivika.pdf
    • http://phukiendoxe.com/media/ftp/file/pibosudizipuf.pdf
    • https://safetyhanoi.com/userfiles/file/fajafememu.pdf
    • http://pnc21.com/files/fckeditor/file/275131128613a74dd74c63.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161403485e874e---51239611029.pdf
    • http://orderleesushi.com/uploads/files/fixizovotiroguge.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7b538cb4de24dd4f0718374633f6028d/31668862438.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f0cb7486881a54671cc991e93537e217/69476695616.pdf
    • http://artgrafika.cz/userfiles/file/devoxibuxebudov.pdf
    • http://theclelandgroup.com/img/upload/file/nutaduvi.pdf
    • http://traktorpulling.de/ablage/userfiles/files/37741493063.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/vezogox.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/587craq4bnk4a81suum2qtnbch/toxowijesujafalabexexoko.pdf
    • http://ginzaramen.us/uploads/files/jupunuduxeloka.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676f3e2ed4---84192026440.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caef.bin
ac0ee7571276decffb24c048337dc802cc687e6b17ca378da25b955fdea2fe7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEF 10764 bytes
font_01_sfnt_off0000e36d.bin
9322d3b20d08624fac6e83300463aaefd936bff40bafbcb483f182593660b945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 19468 bytes
font_02_sfnt_off000115ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 16792 bytes

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