Malicious PDF — malware analysis report

Static analysis result for SHA-256 461cafe2ef20792d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 16:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 28bd5954aa92b8bb972e189d812496e9 SHA-1: 130c5017b444d9649825dea3846b391a4138ab12 SHA-256: 461cafe2ef20792d4f206fb0aac98adada73e39d09b07dc5b0b7599026db7017
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to compromised WordPress uploads and other disposable hosting, indicating an attempt to redirect users to malicious content. The presence of JavaScript suggests it may be used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clinicaveterinariacene.com/userfiles/files/77685263317.pdf In PDF document text
    • http://pinedafoundation.org/imageuploads/file/putowo.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/lusezisuzeturapimuduwuzi.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/puzakivejon.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/daliduwusiwatu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/wizipozurivilamudaratep.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b372603ca4---64923862154.pdfIn PDF document text
    • https://12shio4.com/contents/files/58027749134.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/34665448901.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/95950207041.pdfIn PDF document text
    • https://iwistw.com/upload/files/74705044542.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/47164871114.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/30889200510.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xiwekekinuseduniluwin.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/benivetokupune.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/33252542504.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/89744791324.pdfIn PDF document text
    • http://chromavials.com/d/files/68959416829.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b348c4ae2d---6319117502.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bejuf.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/72912379699.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea0c09fc61---3909059266.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/93165173641.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/70897814225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=disable+autocorrect+android+10PDF 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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 10780 bytes
SHA-256: 993ca47bc6bc45f6e79b49160b907bcfac8470fccdabd5de8161c836edb53950
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 19248 bytes
SHA-256: 44e3d365b46252c64e63b39de3e3c6c77391f49702d8d0ea1fb98cef8ede0836

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