Malicious PDF — malware analysis report

Static analysis result for SHA-256 b099964e8d11f40a…

MALICIOUS

PDF

82.1 KB Created: 2021-08-23 18:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90f30b1bed0c77edf7df3669a02d4e0f SHA-1: 115b2086465fff5731a687b6556aa34431679a4a SHA-256: b099964e8d11f40af582afe96bad8fdc984e7b7f58714c3d7e23e6783bddee2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such sites to host or link to content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=phrases+and+clauses+in+english+grammar+pdf PDF link annotation
    • http://atomiccm.com/userfiles/files/gakifun.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/rimuzowunowugisulawat.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071913c54216---gaguxagita.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wuzimor.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/16441657182.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/57039877011.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/g7e9l5binoetk3ou2q3441bhns/26906452935.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/nozoramuzoralemumuliwin.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/710ee68667d93cc8a6f3afae3ef514fd/javorezajoni.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/n1tqetdi46gjtk6slnqt7ird9k/78066451078.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/do17keiq4uf80nkk41m3sf20hm/xulajuforatikaximin.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8a93743788a46ed4ae7a381a04a23bc3/78762410397.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6tfuifgr2ef463p7tjsf3ag5i7/gejosidojujogivukunevoti.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/31965640388.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1939d2982a173fd21f6c40d49074d6e/gapunereren.pdfIn PDF document text
    • https://codecs.roimages/file/sijidoxuta.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/12592106681.pdfIn PDF document text
    • https://mnlex.it/file/8203838446.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0facc5568---bazok.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c20d5d8605174f766020d8ef955af1df/wukiwenaku.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zitefeza.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e034fb12d6736008ed76fc3c149fd8f5/xexufineragidi.pdfIn PDF document text
    • 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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 10952 bytes
SHA-256: 4823518d3f0f68a438c78d95003076c5b09ef8112fd2409b6e68eb9f0f1751ed
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 16480 bytes
SHA-256: 8019d472da042f9554dfbc87994928a12a59c8705c69a89d8d5006dd98dc2555

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