Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0193cc72a53f0e4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 11:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 432b427e9654bafea217ab096dfaa31f SHA-1: 028817d387f33180e91d5d12925032d101d7c8fc SHA-256: f0193cc72a53f0e4734e5c7b5577841fc1f72e04ec5bbf240034c6d02d288865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. One notable URL is http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ded1192a73fa8f28d3d08ee67efb1f2/lowiligumad.pdf, which is part of a link farm heuristic. The presence of these links suggests an attempt to lure users to external sites, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://libertyquad72.fr/userfiles/file/bubuf.pdf In PDF document text
    • http://fittbikese.hu/files/file/74107821462.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/bowokasu.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/galemetewurivenuwibo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wirojorezepo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/78890007337.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ded1192a73fa8f28d3d08ee67efb1f2/lowiligumad.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/remugofiwino.pdfIn PDF document text
    • https://binhvi.com/upload/files/77000647359.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/55286059075.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/gerakisetokamikekupekaxod.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bakole.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e051ed18fc3---944928993.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lpl45ai7uas1a5ifoulvtlulbl/89769145170.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/12690626983.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/lunir.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608480bd2f526---famaxuronugi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a5a9fc37---54530468108.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b09dde292e6117954447c62d9c379cb2/31845059280.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/81526618385.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/0b1d2c7c903d4f5dc8bf85b6b1227f42/46957444175.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/tagisonadil.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/29481873780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=line+6+spider+v+60+mkii+manualPDF 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_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 23600 bytes
SHA-256: d14f700ca3a2d89abb4bd7ce8a4c1edc09c2919d00ce77f4554a359e8e7182d4
font_01_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 10840 bytes
SHA-256: c3c60f7bfc0724d1bbc8e3fea1e78724db865147593f4109c34f3816c106b1dd

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