Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ea9e2355c2186a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 18:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8c2cf623a00460442d66d3ae3089516 SHA-1: 831e903aff9f29e66c5d284c20ad5dbfe7494957 SHA-256: 90ea9e2355c2186ad3af6ce362c81ef1c9fb5f5cb2278c4c264f51e04669c8fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://hakkabrothers.com/userfiles/file///24353902543.pdf In PDF document text
    • https://stvorki.ru/files/file/84766342647.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ade894ceeb2---dovag.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2875e28633---36348274476.pdfIn PDF document text
    • http://katachizu.com/img/news/files/tugigubilewidu.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/9221579112.pdfIn PDF document text
    • https://asi-filter.pl/files/file/najepenoxuvugaxudus.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e28abde571cbeea45c7a97143ae07a5d/26772654227.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf7d4ea627---xedadafogixesibatun.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/wofubabowoxipunizexewov.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210706_CE9E62832C7421B9.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/gewaninibozexuvosaneselew.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/muxadifo.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/jisibot.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/472942178.pdfIn PDF document text
    • https://rajaunited.com/contents//files/28500199052.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874784d84d2---42527568750.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/molevitudot.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160943a1e356e1---88823205396.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fdd29e4eb---nimilanomu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/13527322510.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a53519c34c5---1646943453.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sjrgma2vthh2jedh79i133hb14/pugulasumamononapevojoxub.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/94454699811.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/xutexowetitalamomimom.pdfIn PDF document text
    • http://platcometals.com/images/file/gereb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=russian+english+grammar+book+pdfPDF 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_off0000c81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 11224 bytes
SHA-256: 700500eb4cf8e7daeeab6e5ad5293ab46d89629503913f358493778fac606452
font_01_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 21584 bytes
SHA-256: cb2a48b450ed58cad3414671e7f6f0aea70e4520d5c2e31e51dfe71b912a9cac

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