Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a225e1ab6d6860…

MALICIOUS

PDF

61.0 KB Created: 2021-09-03 02:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fd3afc21de6f902e9b8589d104f18a9 SHA-1: ac476887f0ad41dd302273175a942526c657cc8d SHA-256: 73a225e1ab6d6860e1ddd8d0d5913ffb548ad4fd2bf5a8eee11b9a4f2abe46b2
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7265

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0bfcbb92a6cf2cec65ca6ddb0ca295c1/83595074705.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62833a909---76117761387.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/datoraxerugugod.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/76803242424.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35759435377.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/bunefakewexosato.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/mufewokuma.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/nodibunuletu.pdfIn PDF document text
    • http://billsky.ee/files/file/pegomafonedabozex.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/61246465556.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/10170806775.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16081c68f396be---24758180115.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0f794302---foguviwozexon.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2c3b98d3---nozegoriwaposavenukapij.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/phff7o6pjme4l9ve5v3sdgq3cv/10079769444.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/kofurumomoj.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dacd8da7971---tipatekorivagagebuj.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/pufimurameke.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c711b35519a---77362710415.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/95515709511.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bc45d3efc---kaseritu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/6255531828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=repeated+addition+worksheets+super+teacherPDF 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_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 10888 bytes
SHA-256: 658d3559aeb7c9610e6f9a54a8212f34d641be613465d06194e47dba00d671a9

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