Malicious PDF — malware analysis report

Static analysis result for SHA-256 23656a598d034e4b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 23:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c319b81956bfade5a811f3e1657ad618 SHA-1: 63da445f7f005e6cce2ef762135ebb5d9a383547 SHA-256: 23656a598d034e4bbbaa4d071998864249457e7f7975ac77a11d7a0fa38fb8d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://newegys.egyseg.eu/ckfinder/userfiles/files/liputobaliki.pdf In PDF document text
    • https://gdaniec.com/upload/files/novumawuxi.pdfIn PDF document text
    • http://strategieb2b.ca/userfiles/file/78106247956.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/pusopoj.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/88374092691.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73931371632.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/18837339927.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/60802144440.pdfIn PDF document text
    • http://cpviettin.com/upload/files/49466981151.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b14b78921d5e0ea141f1e85804f1fead/13489759321.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612fcb4ead1b1.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134b10c2838d---58991097799.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/xifenuzotujevosuzimete.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/27905861234.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/nobaruwosurepitojifegop.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/zidamag.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/sasenatalizizifadal.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b833bf8cb2d38abb19816bb67c390f55/22642065409.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/17940534963.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/jolijezu.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/88487913830.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/87597813745.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/tabul.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/56043051130.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/44451166850.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909181200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sm+g7102+flash+filePDF 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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 17356 bytes
SHA-256: b688d70bf519ce17f8f420a95433c31fdbc07928f5205095ed3448d5d4d2e643
font_01_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 10660 bytes
SHA-256: 1c59fe72d8c0d5fedd0aeba0bd3cc1025b639460f854433e3eef83bb86b02ae9
font_02_sfnt_off000124f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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