Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b9aa72f44a4638…

MALICIOUS

PDF

80.7 KB Created: 2021-11-02 22:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf9316698e895ac270bca23bd537ef2a SHA-1: bbd96265edf64a8c9e1469613aa8e8be3c7f389e SHA-256: 06b9aa72f44a463882243becf5a9985ae55a895609d68de841713de8a98e8fbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm strategy, directing users to various URLs, some hosted on compromised CMS upload storage. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://begemot-rus.com/uploadfiles/file/2021091519575573499.pdf In PDF document text
    • http://alanaf.ru/userfiles/files/rusejejobu.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/wovekotutuvez.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3cde5e109---41569751715.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210901132244.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c706514e3---vutugepeligo.pdfIn PDF document text
    • https://etimes.mn/uploads/files/38407666875.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16152cd2ce0da1---46097706491.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021092322531_430387662.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/73203211207.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/matatagimasag.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/2426001569.pdfIn PDF document text
    • https://isosklo.cz/uploads/tuwiwen.pdfIn PDF document text
    • https://halkum.rs/files/76959388289.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/mojis.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109121433002892.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/15027349900.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16353443370757.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/12221035033.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7g4uii200m25dvh0u0sqb1nno1/vopuwepovudofofipoxuxinus.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/90215030796.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210918114621.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/fijobitegidapel.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/golekoweseg.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=photoshop+inverting+colorsPDF 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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 10560 bytes
SHA-256: 82a20b8659d330315c998926b1941ef50f0846266a8e5c4c0b47de8b5aa85429
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 17780 bytes
SHA-256: 98fd3a1333f5157ec1663a8872f0690266ac325a027fd7d700bb0fba8a8a142e
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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