Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa09226d287f2bea…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 09:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 046f74fe5efbc4babea9038d5a6ce231 SHA-1: 0cb65a8ea8818df99ae4ad95443d8570aa6891dc SHA-256: fa09226d287f2beabe09788afd0b33cb372a21372a1be5dfb7da8e55beecb11e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised or disposable hosting sites. The presence of these links and the overall structure suggest an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://giaiphapthietke.vn/media/file/files/jopumubev.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/41entn0prm20ifjidhg4mrd9a4/9093197792.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/mekarilanejenovipu.pdfIn PDF document text
    • https://coevent.ru/upload/files/17723978422.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/4585828751.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/68345693240.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0b74637ecd9ea75fd9612591a9f18a69/27588755922.pdfIn PDF document text
    • https://gameclub.by/uploads/files/48463701765.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/44468335462.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/10359855958.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/xidolofezapel.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/sodoso.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/bujepiv.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/jukiridovinaxuragepobufur.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xufobufunig.pdfIn PDF document text
    • https://lazerom.pro/media/file/776863536.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/84350861232.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/kefufaxubizejevo.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/purufade.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/rafafafuzidivukoxe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea7cd30ea---70700594951.pdfIn PDF document text
    • http://highlander-inn.com/assets/userfiles/files/zajoxokewasomaritujad.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/43917710763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dead+ahead+zombie+warfare+mod+apkPDF 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_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 16120 bytes
SHA-256: 0613a005031782a79fca4eee425e91c72f8c498b0daef3768c41e1a463e24bc3
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 10724 bytes
SHA-256: 3608382ae5c74c000deb3b6fdf8a0cd482d69f47fca89db33490570ed1a88cd1