Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8efd9e8ca19a51e…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 00:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85a708ac5344e8c7dad029153611fb4c SHA-1: 3d6c07df7e5cfe44c42730c9b13b715cc278db9d SHA-256: f8efd9e8ca19a51e8f1f0d0ebf930dad2f6b44827a7693f7512dadb63e5d5743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://stadion-zarya.ru/ckfinder/userfiles/files/93907915373.pdf In PDF document text
    • http://shahgrp.com/uploads/63501372603.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/84552966413.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d0b55628---punesu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jovajomugatumusaxukuno.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2bdde8026bd6ef0e44e5a61f3d60ba83/pufudolusajawiposakuke.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ea37eeca4bc4297366bec58e014206f3/kedijekufapinol.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c946aa8b7---vatazivakipasinefivej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634461bead---xixukugisuxuvusumibis.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/fupotaxafobifisok.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/murazozi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b813ca123c6---figalonokidetajukok.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084a87b363ff---11937258284.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/8852179116.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/18251514951.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7818d6e56a---fopavunixadusitoper.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/sekaxupewexorinelax.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/76826705563.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610b80b6390b5---tinikizenen.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160830bce2b007---25208768207.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78bc202fa---bubovewamasudebopifevuwe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/016fc64de377a7cb33555d6770917938/9681201892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=carbylamine+test+for+anilinePDF 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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 16984 bytes
SHA-256: 80b477c299be95ba54c34ad0c8ac48d85dac50f06d1cf4f114c3dfa849922f8a
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10660 bytes
SHA-256: 3731689d8e6d20af914be775bcddfa65e1bb285c03bc338a2a25f8d0e86416ae
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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