Malicious PDF — malware analysis report

Static analysis result for SHA-256 2938058c275d70a8…

MALICIOUS

PDF

78.7 KB Created: 2021-06-10 20:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93b168e7a1ceb3528c44aba9f9d62cbf SHA-1: 55ba0a083d406179cc2ee5524d000f0345fc726e SHA-256: 2938058c275d70a82784e225b811912a11c24a3e1917e943bc19751649cdb23b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The presence of a 'download button' lure further supports this, indicating an attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=motion+presets+premiere+pro
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758cd88ddeb---66905107104.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/240e0ce440820c37935d33eca741e3dc/96348885047.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/4c78d7ae182d57aa324bcb0728557881/biragubuzi.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b054197bb---nimisuxiw.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/59caca31a739c8e2c85249d4ce448791/ratag.pdf
    • http://banghetretunhien.com/media/ftp/file/81681664619.pdf
    • http://iaestedresden.de/userfiles/file/nafupugoro.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lfbc1a7glbj3tnoijjtilf8nm6/nabilizovurarujopez.pdf
    • https://cristalensi.com/public/File/puwiwelape.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5ad930390267d15293409a6735cb3ba2/siboradupe.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/rlu3346lt4rm5eb5dgd9n26i0j/nugeduxodamavufukub.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/917f7d4801902a43650396ee7fab6bab/1677486210.pdf
    • https://slezanie.eu/userfiles/file/27361316709.pdf
    • http://slsnn.ru/content/file/6287638781.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873b7686d7c---17729444079.pdf
    • http://hgbs.de/userfiles/file/48807455125.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2d.bin
2eb46f8fad31e0b2855f16fe806464af8180a80ac5b74551f1108642e8f6f55f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 4516 bytes
font_01_sfnt_off0000f966.bin
4a58191d2b27cbf1346268bccabdc80d85dee7f78b926bf70b3e4f9ff8141857
pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10712 bytes
font_02_sfnt_off00011e3b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 4324 bytes