Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad20732d2f6c49c3…

MALICIOUS

PDF

54.0 KB Created: 2021-09-04 07:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a14c6b071e95df42addb351d95296a7 SHA-1: 613e3c8e4c074362c92507ac07522f093d5dc82a SHA-256: ad20732d2f6c49c38af814a0518fe34df155d2384e121212427be2d49528b93c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further payloads or submit credentials. The presence of external URIs and a link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6975

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.
  • 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 http://aiaato.com/FileData/ckfinder/files/20210713_7FC1AF74652A0B74.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3122daefde04fdf5419ad85d8686b9b2/wilobomarajiripuz.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608328a9b5317---goxaxexesekurowiz.pdfIn PDF document text
    • http://wenxuezj.com/images/File/ruzosa.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/79649299946.pdfIn PDF document text
    • http://esangsok.com/upfile/files/85168598976.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/liriwopomajurenevites.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/lebuxalefakopujavupi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b56c434b---8269292925.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72fc33f2d---zarinizise.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/95006817702.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6vlu8jo6j1oss28gvdgpjm9cu8/vefevakajas.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/lepasipowivodi.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/78627164859.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5b75v7rtt3ca9ligq8ebodtjuk/lexarabumawenuviregeza.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/95583692068.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/tadogelilotekusigi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087449497d2e---91751399488.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/datifoxexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=amish+friendship+bread+recipe+pdfPDF link annotation

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