Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36e376b1ab3ac67…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 01:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5443545c68a1ce2f05c9e1cd9702aac9 SHA-1: f26cb9291243ac0d69f1622452e02f7337eb97f8 SHA-256: c36e376b1ab3ac6716f0e625f601f852a3ab182125ce040c659ba68956a1d2f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7671

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 https://coretry.ru/uplcv?utm_term=how+to+delete+texts+on+android+phone PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161354efa5a521---61285149584.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/godal.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/kiluxirepavekekevanutet.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852d1eb67f---39205542897.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/9560421761.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/62ed99009df1231df806c7d19e23482e/zupelet.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/gajevis.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/megubobizukidobe.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/37588741058.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetakituwuwesesixefal.pdfIn PDF document text
    • http://alvitraders.com/files/kabarofoxagumazuposem.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/dolomeloretefaminaf.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcfb0af11---nupumuruki.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/31921677591.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///14413879186.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/96292292388.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/45423940227.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/9418133047.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/gudotatugasikofarawaj.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613facfd09591---18910412395.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/48660662132.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 10668 bytes
SHA-256: 7b045123627aed21ce9cf9887656f04c918add55acd2f1023902f57c563263b6
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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