Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5bfda571fea97a…

MALICIOUS

PDF

75.4 KB Created: 2021-08-05 11:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15fd7db26494fefa7b64ca8e37f9e65e SHA-1: 557204a36b8916eac5f575e6c7d51cfbc8bd41bc SHA-256: 0b5bfda571fea97a182171801b5bb179a8ebeef9b75f31bbe9ed1d4dd4856b37
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure suggests it's designed to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9479

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 http://leasingtowers.com/ckfinder/userfiles/files/xenisogiguwatetesag.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cruhfaqp505sh47o6hraikpugd/labezavukava.pdfIn PDF document text
    • http://dnepropress.net/files/file/zezosexebedidunolokuke.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/85d1ea127989207a9b18d5744e7d4436/76251608960.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/4977770327.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16092efcf80317---81939407474.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/o02trvnolih4jmcsj46o203vi2/9816035043.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/80769981498.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/nobuvesemujugetekakuw.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e7768d31db7e586c340a9e2f6d8178a7/21925911748.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061912044670554.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/narujabumaxifebepasot.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c79cd429---7539969649.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210805_ABBDE7797BF08C89.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c8e07a65---22114927626.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/lixinumim.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a287936600a---79591524182.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/66825355953.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/if058mrnvfi3gebb2mscorqpv2/49862472189.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/79161002533.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b02ae8bd3---93469859132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+golden+age+of+literaturePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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