Malicious PDF — malware analysis report

Static analysis result for SHA-256 44141accd7d07894…

MALICIOUS

PDF

68.1 KB Created: 2021-08-10 04:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 027eb275d0d5fa8a690aa05d79733bca SHA-1: 05aca8523d2c93f8ae4f02d375eafb8e3bf85cf7 SHA-256: 44141accd7d0789402e266c5a75fee5d4e29cc71c65c669cb05d8c19ec12fd66
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9583

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=microelectronic+circuit+design+5th+edition
    • https://villadorottya.hu/uploads/frontend/files/zolazig.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/lidafoponakezerozuzukada.pdf
    • http://accessiblevehicleservices.com/userfiles/file/61071667767.pdf
    • http://em-mould.com/ckfinder/userfiles/files/kawabufevuxegiputi.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/f716989b05d310f4892831b78382224c/69125290262.pdf
    • http://nuovojob.com/userfiles/files/vowobojoteve.pdf
    • http://sicilalluminio.it/userfiles/files/xorasosefatakojewalipo.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/32e8d221efa2ba6e0a92179938e7ef6d/feveferomepipuv.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/g3udk0diclfnlh9js26q9gpjnh/liwofapoliwum.pdf
    • https://motacademy.it/file/tamoja.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/wepulumutavetifewiw.pdf
    • http://cuspsurgeons.com/userfiles/file/15661162038.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609700decd27a---wazonupulozenawij.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/klfmsnm5g0u9r51e2vscsue9op/22805092378.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c0d3b825---1307296022.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b6faa679d5de8ac23da8e2cae68fa2fc/49630445480.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160931b070678c---12845971664.pdf
    • http://smartdeal.pl/files/upload/files/52940149319.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/lezalarumonesilamiwaxo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1bb9ee29abb2a6a0553a0850ce693c73/19520057475.pdf
    • http://robalton.es/Albums/images/file///bakukoboligevug.pdf
    • http://jfac.kr/ckfinder/userfiles/files/53482373323.pdf
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/xewuzefelejotalikab.pdf

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