Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8afc2a9a26eb772…

MALICIOUS

PDF

63.1 KB Created: 2021-05-22 11:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f2b0f9f1bb3c6a7dcd77f71aeabe78f SHA-1: 5d01c64dd6e13ed32faf352531728c79b6a6d2ae SHA-256: a8afc2a9a26eb7726fb8873fdb783846028f92f2471311c58db0d7dc8f95c462
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier indicate a high probability of malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8612

Heuristics 5

  • 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.
  • 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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb246e2838---fasinodog.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e8riuhvr1fk42v9k1rqrftp3k1/84613394961.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/33389513056.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6742a4aebc61eaf7d21893693abb99a5/rebarezekepitoz.pdf
    • https://acrgroup.nl/userfiles/file/tonuzisafivakamovo.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7e3d1823---21189499933.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1cac768af304991add2a15b8c50412d3/16093934550.pdf
    • http://adria-ex.com/images/blog//file/domofu.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608659b35b2d8---komabegadorutuxufidupomaf.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2352992ed0---51229847590.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/13234952089.pdf
    • https://adepotcustom.com/UploadFiles/file/20210508143043144.pdf
    • http://gyobel.itpublic/file/tekadujemosegu.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/94803f8deb4bceb5b87c17a3e9a27029/wozikefedilunalobugale.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d55448a5a---bavol.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vkmb05bjgk09rc60pfpmroc5ts/jelupa.pdf
    • http://harasim.cz/uploaded/files/68928651359.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+remove+a+ge+spacemaker+microwave
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0b.bin
5f5e68ce8ea4b1b2b20c26a6a9a676bff71c8dd756f52b6d5f583d6ae4a0f6e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 5400 bytes
font_01_sfnt_off0000de6d.bin
73ae81b6d8b41f139492106ac397826d29465aac196a76e05885033cd7d398af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 10600 bytes

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