Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9e928afeff25e3…

MALICIOUS

PDF

81.2 KB Created: 2021-10-06 05:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c92bf72d385b233c995120258da8b62c SHA-1: 44ef064f8693588fa5f13504c94381e683e1958c SHA-256: fc9e928afeff25e3d40eb35e7db34cb879d1400603ff4d2b4e4e8e0a4749be59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

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 https://inwebjor.ru/uplcv?utm_term=vice+rector+for+research PDF link annotation
    • http://eska-lift.ru/userfiles/file/36497610723.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/metazarunujuzumuwunulep.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/88949995157.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615611a597244---wedusope.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/powarigozepiluwadolipaxi.pdfIn PDF document text
    • http://obuchenie.bititechnika.com/img/file/69525167426.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qp7mvkjbn6gh7a7s8tg2fg89be/mubobevixobe.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/dulafexivowola.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/93670789472.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/57040019894.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/55696750574.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/18534534615.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/xomabojobu.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/94137810255.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/20698324982.pdfIn PDF document text
    • http://generaldistco.com/images/file/27757809043.pdfIn PDF document text
    • https://slide-bearing.com/d/files/576538083.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/44119733986.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8922bd7b105faab878072edfb03cd267/kosaso.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/sasogiduxisi.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/beteruzorubikokanapo.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/zebijitifuwato.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aca46bef7---livakinisipokakiluwusosev.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/mexinukib.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/tikaja.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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 18300 bytes
SHA-256: a13fe66bc105cd06a6a2059018bedb46ca8ecf9964a17017ba507feb830d08ba
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 10252 bytes
SHA-256: a20520b894c6dce6facf7e5aa9861efeadc818cd88e5f4f5a459270deac4616c

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