Malicious PDF — malware analysis report

Static analysis result for SHA-256 2def98524378bc85…

MALICIOUS

PDF

46.8 KB Created: 2021-10-17 08:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd4170e730921d93cc1a5a21113c7320 SHA-1: 4cddb9c7447679b0ba1bce29be604a054e6a8d98 SHA-256: 2def98524378bc85bd59f9b6b23f72b5760720b05d2e412f88b2d3a2cc757aeb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The presence of external URIs and embedded URLs suggests the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8030

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 https://nomylo.ru/uplcv?utm_term=examples+of+miscellaneous+items PDF link annotation
    • http://ecocj.com/userfiles/file/20211005070911.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/kusibugatufuragedup.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/22727599844.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/1488834777.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/90874953465.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/gidemegixe.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e397255b5---mafowetiwoton.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/punenaguwodavumi.pdfIn PDF document text
    • http://atomleasing.ru/media/File/wesuga.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210923120847.pdfIn PDF document text
    • https://kimcert.com/E/file/vawegukuruvegoxa.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/fodedepadalivuwemawuxome.pdfIn PDF document text
    • http://opsir.eu/files/file/fojosasanirekilutedadiw.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/rerazepapetelal.pdfIn PDF document text
    • https://isosklo.cz/uploads/tiwobuwuzijomajubo.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/wegali.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/5289066821.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/barebutoranopa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bt8618pic32evdrukpkj9rqg9/89979754798.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145041c47599---tiwifomugefub.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jobonixivodudutuf.pdfIn PDF document text
    • http://zaiger.ru/img/file/45369060262.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/49738609024.pdfIn PDF document text

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