Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf94bf927879971…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 15:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e6b742dca3f9f41477244df63d59ed9 SHA-1: 5a66e8e039b499432a87aca8a6dbba3335f8ef9d SHA-256: 1cf94bf927879971c15616640cefd4e73d415826b5f0d55c31145e89be978cdd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=scary+neighbor+3d+download PDF link annotation
    • http://uklearningnetwork.com/userfiles/file/nekugediduzokake.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b48adc7ab9d4430e19ebba730cf9a7a8/73946670995.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/66013122179.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/xitijubosovidug.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/95278303638.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/vutagawo.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/zulediviwux.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/55840750360.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/41983245690.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/sivadazatix.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zurovixuko.pdfIn PDF document text
    • https://datajournonepal.org/files/37959170729.pdfIn PDF document text
    • http://frchem.cn/upload/files/fifukepavulirorenaxupomab.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210911063550333.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d9dee44f---xixidewagamuxuxepob.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/vifovegilutabogemijo.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/88281787204.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/64239754999.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ed61f7d3472ca83076e5e4c60bf2c20/33441449570.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/29579396244.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/tevavujevasadaruvejijipav.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tiferije.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/4995758735.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/butolilajazepixuwon.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210905083530.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/worepudowegawowi.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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 18928 bytes
SHA-256: 129f6e3a5f773bd9aafaa5ada74b15336faee5d5fed7b91fb92b79b346b18577
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 10972 bytes
SHA-256: 1d5a189b944797d777b0f8d42124acc37461a237990047ee382764316246c140
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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