Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fff5946e804fd13…

MALICIOUS

PDF

131.1 KB Created: 2021-06-25 21:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: de0a523ff9d99e4a3431361f298789de SHA-1: 072b3bba9749cd336dd71cebb2a384a3f4cd00a4 SHA-256: 0fff5946e804fd13b1bdbfa4fa1a7789000168331e0ddcbfcd8a2318b800ce80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO abuse. The presence of multiple unknown URLs indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e13bba426---22036448407.pdf In PDF document text
    • http://qytbearing.com/upfile/file/2379394072.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589f472f24---sotixufubib.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/96e3edd3ecf56c1592bc9ae0bfac7e04/xosaxokogedepi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/sarus.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeca9936ee---bosomomurijoj.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/zuforemu.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/21758575055.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4j0v3bb0g1klfgp5o4q3kpmd95/ludebepomufituvabepo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e14e260c3---vuboj.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c751ca08969d07c2e963291213b278a4/xobelipi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jdkb1528hva8tcopa24944aiq2/39083385788.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/niwadugudarububoke.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/kedaduridakawizevepiporet.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/fokisipazokaruvulizane.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6408d954---nurafipijome.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b874a7b031---nawopikagu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gawasakanororomonozexe.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae4477203---58112586203.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/98382619dc5c830bc9dbb4fb26a77319/rapubegodogonebizuz.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/bpa6etadjju5qepg339hvul5q4/55672568719.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e50e0e4fc38b0f9279a1618c6cb3f171/jisujimomuxilufulozoladi.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/90896773458.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dea37a9d3---17616941951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=adult+education+and+lifelong+learning+peter+jarvisPDF 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_off00019a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A0D 11072 bytes
SHA-256: 23819996f5f766ce4cf7f6a458ddbc6c6d35eef1fe8cefe45f20d0c046911195
font_01_sfnt_off0001b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBD5 20644 bytes
SHA-256: 8e76e52663fb98e598429da31c747f0345280b9eb007f92c8f69377624fb32ab

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