Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35adcc9a1dd09b2…

MALICIOUS

PDF

71.6 KB Created: 2021-05-27 20:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009c0083facc958236ea8f37f9504a4d SHA-1: e7f6c9bff82853433ab5729590acf44d97f4ebee SHA-256: e35adcc9a1dd09b2a8e166bdc8853bf0b5e1f6eda11e00aa9fc570ed7c93e5ef
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=what+is+720+degrees+converted+to+radians
    • http://apcmagon.com/userfiles/nobawutisanuk.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4611440ee---69052765502.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93e6a6b1---kuwogepuvazujadowet.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840bfc2ab1a---wovixuv.pdf
    • http://praconsulgroup.ru/pict/file/81310391783.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8cg45pj5gg663voebosmgdv115/6178803174.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b121150d56d4000d3cb21c8b15c3c8a1/32237718814.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606effa90f3a9---nipimepezopovozasawip.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607815990116d---960990295.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15e08ab68---4571152996.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098776bd2bcf---gizebune.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c8616581---pajejomakasigirapogojup.pdf
    • http://andlupa.com/userfiles/file/2974855417.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/cvn4htc9pg4k2eok1nrvmd87j3/23848149451.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d716.bin
4d7403282e637fe65232f5b435ece70629c6d84bb6cc66a4724ffd86a1ba4c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 5596 bytes
font_01_sfnt_off0000ea34.bin
02edec9f991aed8369219b7ad52a4ab2fc88fdf84b28967c5e94a94e1eac60c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 11380 bytes

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