Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce6bcd33c84e289…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 12:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bba028cb0794b65d6465ec49ec5e14a5 SHA-1: 3fcd3d9a12b555b7bccf65e20c7cc8fbae0fb762 SHA-256: 9ce6bcd33c84e289c80d1eec13875736f99e50c6751e4e11347fd47e4db97490
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, with multiple embedded URLs pointing to potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=new+tamil+movies+online+watch+tamilgun PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614765df544d6---27812088346.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/goxakuwaxabudizaxozaj.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/65140058747.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/67227975846.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c065f38c92fa080b535a6ed3927c7ff/vuxipoki.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/jopavuzirofifuwexasesavo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b8fa8c5d1---mobaporakizulufoditutoxad.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153832974e5f---dekisowo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nalmctomdlens0j1hdtk01r6tf/sozowipulukowilakide.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/22747672175.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/diradada.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/musaf.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/jetupuponuwina.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/29680119091.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/dedejosob.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/35853082301.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/99827532833.pdfIn PDF document text
    • http://salwex.hu/file/vudoliju.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/puvemigegujigilu.pdfIn PDF document text
    • https://emmaushuis.org/pages/wopusozuxox.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/33725859624.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_off0000ae88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE88 13956 bytes
SHA-256: 77fa00090e3f6d248f5601244672b82722af5670358f8965866e8fe2c4eb27fa
font_01_sfnt_off0000d12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10808 bytes
SHA-256: a0e6f4f0e23e04d3142ed7fbcb274e640f2542cbb684014a268c9eb27a201502

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