Malicious PDF — malware analysis report

Static analysis result for SHA-256 f036118fd150e163…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 12:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1757485cd683345646d425620b628a2e SHA-1: fb972f7e587fc2ab0774996a7f39fd4f23f85aaf SHA-256: f036118fd150e1632897d31ab9234b46f267df2e8b1bf001a6739b82989b41ed
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wastran.ru/uplcv?utm_term=repair+corrupted+pdf+files+freeware PDF link annotation
    • http://consorzio-csa.it/userfiles/files/69633182557.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/sotesal.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/t0bp6f66ofqiebd1lop5n228b6/66606550531.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/fivebizimedawarasavalij.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbf67f88---75811576554.pdfIn PDF document text
    • http://tai-group.com/upload/files/81557861175.pdfIn PDF document text
    • https://rinducm1.com/contents//files/kilaxozomugapaxutuvud.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/20935397414.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/32889480518.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/puzemed.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uuuso5mjtt14t2ro8gh2l4dfhi/16506723919.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b93e5311---kazedetur.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/73267583660.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/843fc6eaa2c8d866e0ccb1c4f1d50c5b/87428702155.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/49069609434.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/93336000960.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/ridukuzogofifabifawo.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dc69c8e4---kugutabusixe.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/89804888823.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/milijafutuvamibokopipedu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9997d57069---84860646190.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_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 10740 bytes
SHA-256: 064a13e2cc463c48999501e9a061b1c719c6bb1ca93e090994a568a04a1fb8df
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 17608 bytes
SHA-256: 695de67f494503dd3cefae27d4ed22ef2769f0348f8ab9ea154226bccd32c3b8

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