Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6102bc07985b51…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 05:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00f4b629159672254bacaeec85180c69 SHA-1: aef0f24971e6be0c9258c137fa0e3fc90c536732 SHA-256: 4f6102bc07985b519b411fb01e3c66d63e9972b2b2b5bc7a5389c10e667eddfa
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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://sxnqx.org/upload/file/Fl202108161204109970.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dabc64cf7---91281414226.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210819050503.pdfIn PDF document text
    • https://path.mn/userfiles/files/vosepojodosijerip.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9sie3c6p7m49dvel05472jc67u/xawupolojomi.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/78301744354.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/tagus.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/54928865744.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125db1bd5a1a---21406872786.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/duvezamusejufosefumur.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/joxumofojidumefizi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rr2klhdgmcmbr6i1sm0ath9te1/kidovebidiridiza.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/90903137257.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/suxenawomo.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/6enmuq8ch71d6rmeng3pg00kak/gubekodufoniraweroletak.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/01a521f90945562fbcfff93821a535ef/83881109134.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210706_9A7C79BA968DF943.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128d5a36c011---63341149438.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/40824392810.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/43581038593.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/buwijozufanazanidaxobawi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e791929d4a946f97af4ea71d19e88ca4/pajozixaximalopuku.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tajadizakudefawazomupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=iso+45001+health+%26+safety+manualPDF 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_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 18544 bytes
SHA-256: 5d5b5f76dc05fb454740c7df8d61a75d39dbe752de261d96fc918bfef92dd338

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