Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adefb8305925504…

MALICIOUS

PDF

64.2 KB Created: 2021-06-11 17:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d54fb74e960ec8b9db5a2e0675ce642 SHA-1: 13ae7fad68162d0cc0d328913b390336fe30b782 SHA-256: 1adefb830592550464cee5dece5acee95416739021e476f76a2cdda55ca41f68
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9578

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=resident+evil+3+apk+data
    • http://zjpjxt.cn/upload/uploadfile/file/bafizemuvaj.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079659674460---gurer.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160847bf3eaa7c---19830076258.pdf
    • http://asupuro.com/user_data/image//file/xajidelupuninatumivu.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45bd1daae---8843378161.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gdr7tggclh7357dmbh90otcqls/21213200467.pdf
    • http://berbun.com/user_img/file/93888879408.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082358064140---lanuxofuvetuloxisazu.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/busag.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/ferinusapirebojuturo.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/vowupibebebolivowexitotom.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c5da8c2a46da0768674f257c3f754df0/33894453061.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e71e2ab7bc1bae18c6cfc3f96373d82f/dananem.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7a607552---zifesuvegatonexidad.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/00b367e78135b90953ad70bddf23b457/84920980099.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8edf44e79396cf47dd8a9095a598dc00/gedavusewajowitedeba.pdf

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