Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e2ad4d613d7e91…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 19:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db9c92a6ea5da389d70fe2e1402a597b SHA-1: 31ae277ab01269129dffd2010e1e5a841f412909 SHA-256: 03e2ad4d613d7e917bb33e5ffc77bd67890a1c763e1fb1d24cc2e4a7501e2a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fluitec.fr/ressource/site-image/files/bufenise.pdf
    • http://eska-lift.ru/userfiles/file/11538290701.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42664538106.pdf
    • https://maydangson.com/vietkiendo/upload/file/60151832240.pdf
    • http://sun-green.be/ckfinder/userfiles/files/74903036715.pdf
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/fitadimobajar.pdf
    • http://kruengrangthai.com/files/files/70821940179.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/7637270650.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd1d6302d---mivevuxazugusaka.pdf
    • http://msamericapageant.com/clients/873634/File/vunakelesuge.pdf
    • http://ruresept.ru/files/file/30236309652.pdf
    • http://mmprogetti.it/userfiles/files/64604563902.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5517c019972523e420ddd6c5717a0073/sumekopipafoxifozisu.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/aj1fu40e9vna58k7tac9nt3puq/xixurafekugidem.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e622a9918b---nadafuvewigawadirilomolu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84faf2031c---kijoxilevumigeposezaw.pdf
    • https://driftwoodcc.com/userfiles/files/77214887882.pdf
    • https://mfdesign.hu/files/file/88997755195.pdf
    • https://sealskinz.ru/files/file/wusifazuxerixapuz.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc0d680dc---62439627615.pdf
    • http://britishcytology.org.uk/ckfinder/userfiles/files/1381340554.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e296dfc5958b90346253104eccf2565b/terereribalun.pdf
    • http://2ds-creations.fr/userfiles/file/tuwapavumabobe.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rdtnv3d6k4dp6ivshu8gscag6c/26559573396.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e230e379804f3336d539643232d0270/18063983760.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ondas+electroencefalograma+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/115b8f6e4254058dc599e87dc2fd62dc/28326698845.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_off0000eedf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 16792 bytes
font_01_sfnt_off000106f1.bin
f90bb1cf21f7cd9a05f9db28b631466ef704db7be326a7c511e80c20fe041013
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 18448 bytes
font_02_sfnt_off000136aa.bin
ed49bbafdaf31561a25fbbe476933f7b1a4d8ad25e87bd8e28ead461c6951724
pdf-font-stream PDF embedded font (sfnt) at offset 0x136AA 10896 bytes