Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c22b59985896ca0…

MALICIOUS

PDF

76.3 KB Created: 2021-05-13 17:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d08fe3dfb32f630d096ceffafbe412 SHA-1: 841483968e2cc39c9e7eff5c7a82b75d7cfb27cb SHA-256: 3c22b59985896ca0c7d7410fc556ebebac77e0ff843e84e45ed51da0e51699cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farms on disposable or compromised hosting suggests a tactic to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

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://mulroyenvironmental.ie/userfiles/file/jubolagokirokaloj.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ca438e09---16831228427.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c5911461---wukizadifajusetaxamizo.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df13cdbb7b---gimuganelanigofaliwuf.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/79a4e2d11697b21dcc9e53a4246e516d/17383001850.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b34ee2b7---27462393780.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd2c62d64---86058017241.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dc83bec9f831fcb68c35d14c7662fb3/binaponodokolazepaw.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/592mubjpj01qlpi3gjodv4pho4/lozisolubixatiril.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd809ad97---48818654007.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918cba92845---23844812731.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160823948e590a---vukaji.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff6144c5e---83398164658.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749bcd73d68---tonuzunenup.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/07e071534c88b436921cd2a46e29644d/gekasawujobizafu.pdf
    • http://nuraski.pl/wsg/userfiles/23542617406.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=interior+designer+cv+template+word
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin
2f8f2ef6b551138f53a1692ad7faf3b44ef7814fead373c13ece2678803205f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5268 bytes
font_01_sfnt_off0000f7e5.bin
ceb9cddd793c4b954b209c12507b49b224fadeee3c4b7f1af72b93411ee1c2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10800 bytes
font_02_sfnt_off00011c97.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 4324 bytes

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