Malicious PDF — malware analysis report

Static analysis result for SHA-256 241ec76ceff7e3d4…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 14:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1081071cfc33a7441e66b93e77b2d92f SHA-1: 5657659dcd91180052ad8f7dc8dc8b9a36ff2027 SHA-256: 241ec76ceff7e3d43334f0be981ec7ac52dc8ae703fb06e03fb0a9c55c0a927b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=test+present+simple+and+present+continuous PDF link annotation
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f21bb4890935b6a4ff4471b20e559db6/7304050910.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/84993198907.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/godilafawa.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9b8ea5c80d023b77f5bc957b205a2e4/14416765723.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/titojimovujamog.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/de814334a04bde153c3eec05b841c1f1/20728343729.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc6a4d7ad---vikexekamavufotenidaz.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kisatetiroxulo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b600fbe1688---24807008394.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/5d757b58a18650da82923ecd0ef11dab/faladugoluzesorajito.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1fe8bfaee9e7025b24b62118dfd6dde3/48965664139.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609030147c798---97124792186.pdfIn PDF document text
    • https://digicpictures.com/downloads/99091705542.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/35956485397.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4898854faa0ee12bcf101e21e907bf19/nerevakesetever.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b7027655944328a8fcc32e2a2edddb06/kewinuralim.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4tb69hvigckj9966mdlrre4ab7/97673715745.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5ca145db8ce16918eb9b103d1af3b1a2/81094106245.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/focb7mmv3famnj9k8dmvqaatt0/laxebogopotador.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 5168 bytes
SHA-256: ed36e855f7ff2adae6f3bb62cd61184ac9e6225bbca18e4ae488dac284209ec9
font_01_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 10764 bytes
SHA-256: ba3e2eddbba405f3550f026688717e7b1efcec0a1a6517c396239746f460d4b7