Malicious PDF — malware analysis report

Static analysis result for SHA-256 d977af7b41c7d99a…

MALICIOUS

PDF

79.4 KB Created: 2021-08-06 12:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5a0e149d6e04e9df0adac1682950469 SHA-1: a2fd8a978661ab5615496b4ae59891097f7c562f SHA-256: d977af7b41c7d99a67689743ceb233aef4044f820ff1086b0efe004419c3c93a
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to domains that are either compromised CMS uploads or disposable hosting, characteristic of link farms used to distribute malicious content or phish for credentials. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command execution patterns within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://toromecanicorodeo.com/files/lanifavavaretapizazawed.pdf In PDF document text
    • https://waroproject.com/file/tiwoditumeluximon.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/co6aq0em89oqlo793mbtgt6s1o/bosotipugugezoresozuve.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/bb627172097576ca96cf7b34ea84c00b/41483583302.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd18e778e8---durekevuzolaxejadolikem.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/8118448505.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f79ee82b12db811e02d027433a901211/nadabiwileduwajubat.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/050t551i8fht58gpmsgf4gruv0/solodaxegabig.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3mb9f5ganb83qvsm0p7m7egseh/xilelujusetozovitonaxar.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/jiwidanimujuzikupokufune.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/11925289088.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/zadebizifawapune.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/sarinokokuduj.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5e90ed4c5eb1afd76f19e5ea8ec7125e/fugisabimatevuf.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/wofekonabed.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe37ad106b---90306337197.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/022325531348.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/40346636752.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9ed24e8a---2649891124.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/96617583167.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e8989b5265d66a00833e7d275757c3fc/vojiwuduwasinavozogujadow.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/debipetux.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f055461bcf---wilokijezezetisukude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=volume+of+pyramids+cones+and+spheres+worksheet+pdfPDF 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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 11248 bytes
SHA-256: 19bf268f24fb2b94b733af51ee25d7ff777b5606789d4cdfd645f67fcab0314f
font_02_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 15872 bytes
SHA-256: d0ca4a61a6883e9a0616643fc566aa93fd1cda6448c89feb18596061272e8738

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