Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbd54e217ca9c67…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 16:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5d24bda181443ccf3fc928358812602 SHA-1: ec071fe74d7569e2d7f0484b2901933562ed32eb SHA-256: 9dbd54e217ca9c67510576202ee5083d0a55283b2cdda19cddc230872fc748ae
156 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. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond serving as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://goksirkrupskimlyn.pl/img/upload/files/gusewapajijalefi.pdf In PDF document text
    • http://asijskepotraviny.cz/files/file/gorupudimawijamovotu.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/vabavaxarimutijujigidora.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/41111781391.pdfIn PDF document text
    • https://clinicscrm.com/img/files/79651122734.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/70580920244.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/zonugibabilesoduj.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/zozavapulazap.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376f8ad7116---kiziz.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/buwenudixexuwopexijor.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/48704549080.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/kititisitonipam.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/54312592759.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8504da9c4---2283571793.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/36163215093.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6a7220312---navifutatojezugigixitaz.pdfIn PDF document text
    • https://codecs.ro/images/file/ramugejokuv.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/lokinizagatakesisufudipib.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kuzesovuzobeguzagal.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5459e6979801d14f8fc83983f4741dd0/juwaf.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/bopubinozuwuxitunumurexi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lm852octm4are976mk17ddj3r8/93558036197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=today+colors+tamil+program+listPDF 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 10700 bytes
SHA-256: c623d68c6435deb3de706f579935f96bd4cbbbae5d7250e4f3450e3c44022e1c
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 17492 bytes
SHA-256: 7d69c7bf760e3898e31481b1770cafb418383b5e44044a4c89e85b5904545834

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