Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fb89c1af339d1b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 22:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd58691c66231160ae5c93aee6eadc28 SHA-1: 82d644a32ec0930db6aee53c533295529a8ec94a SHA-256: a8fb89c1af339d1b0703fbc3bd4c98c458742d09c57d3dd34653857d0bb3c38e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6861

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a6b853d6711968e2ebf131f8c69651d6/gigebetewirap.pdf In PDF document text
    • http://fsoa.cn/userfiles/file/89994049492.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8553ab7f6176d4c9d7602380a7ee5ccd/gowexobonirigomuwewa.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/66729392949.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kidebunax.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/sepuxewefelajanidega.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ni06c1p7aqi50r8jdd068t6loc/977341331.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9cb50c1bfd00eccec8eb24e40aa1155a/retililated.pdfIn PDF document text
    • https://micsys.in/userfiles/file/joxadozoxutirituvejarug.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/bejuzareke.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f109e477---rasep.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210805061443.pdfIn PDF document text
    • https://actor-conseil.com/files/file/68490157472.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf213df9f0---gotopop.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16074190e2bf62---nevajosaxozuragus.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/vikogev.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/29464117571.pdfIn PDF document text
    • http://jar-ted.pl/file/76912162919.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/72f8b6c5a407c4d82a2f11facad00a8d/tinel.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/6144084760.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/86044968766.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/diwuvokesilivud.pdfIn PDF document text
    • http://rcot.by/pics/files/13629250235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=english+file+elementary+third+edition+teacher%27s+book+pdf+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 11428 bytes
SHA-256: 7685b8aea335b5474d0e3b7a0a4abdd379399e0bd86bcb6e722b243ddd56baea
font_02_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 19768 bytes
SHA-256: ad45e17538508b02b92ecbc526fe5d845833352585eacc6d1ba8e763f97316bc

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