Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b1e35e450cc4df…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 16:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b024af94bda0a54295bb572affa16aff SHA-1: fd468ad96c05121432dcf20f87f6d15bfe800d65 SHA-256: c8b1e35e450cc4dfbaf3cfd9e9c9e44658f2d4a0e42b18870d3d794378e2049c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=split+screen+games+android PDF link annotation
    • https://konzolstudio.ro/uploaded_files/file/wirofulosinatatoxo.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/woxide.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/14782668476.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/zemizidotesezoje.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210916071116.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/pamujomapimowo.pdfIn PDF document text
    • http://aven.su/userfiles/file/5138544377.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/xotuvolezebuniliv.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/73253373950.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/powidovitavilaganetusunel.pdfIn PDF document text
    • http://salkim.com/userfiles/file/kipizopenubekusirikamig.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/levurepufefexexilotiti.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614280a9244e1---mibugusezonaxoxuzelo.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/41900051472.pdfIn PDF document text
    • http://simonide.org/userfiles/file/karaxutugorunepotut.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142d698bed65---fanomoserogutisekoduw.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/52051871968.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161359f808ff26---38375025609.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef6ad2fc2---vowikikonebavixem.pdfIn PDF document text
    • http://limoride.net/gallery/file/27103637944.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/zoxipewajiv.pdfIn PDF document text
    • http://pmke.cz/pictures/files/63222353708.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/36060977891.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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 17376 bytes
SHA-256: 1f2eb4c0aecae6e7151b3265879d76bf53b8708db8ee319dd973f5d15114c107
font_02_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 10932 bytes
SHA-256: 54a9e2ec57e6356a765e911039e34605e1199b010858f06e8928a92d457e9381

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