Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a79c1a55dafcd5…

MALICIOUS

PDF

66.7 KB Created: 2021-05-20 14:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68c5eb9aa7ed02a945fd877a35212810 SHA-1: 56d7eb8882f9d144fadc29511923a42a4528b989 SHA-256: c8a79c1a55dafcd5988558d587e1a96936c1dd9cdad700b2f307b6375d9546d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It utilizes a link farm hosted on compromised CMS uploads to disguise the malicious PDF, presenting a lure for free book downloads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading and opening further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8278

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607178b8640b7---semesaxewakiduwor.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8gkvti3uqp5brae88rk536fsi2/32107579313.pdf
    • http://monkey-do.net/userfiles/file/dagufodojib.pdf
    • http://netinflux.net/userfiles/file/devuzozozerezesobadapik.pdf
    • https://grandhotelbulgaria.com/userfiles/file/lexivase.pdf
    • http://bakoca.hu/files/file/60697327600.pdf
    • https://alarrabnews.com/images/content/content/file/laxeromajavezagakak.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72259888a---89559867954.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f7e68fd3bf602b59c60ca7391a361b19/59334131584.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efe43681f---faxikogedowesilajelere.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c6790387---potitikitut.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/tbkj462hlj06o2o3qdcaqa3lg2/51080059363.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ec8a964117431275fee96d9a0fd818b1/vugulitisawuzavajodi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+libro+zanj%25C3%25B3n+de+la+aguada+pdf+gratis
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e576.bin
271ec7ec17d6d0e06bbaf47662d3ef6bdcd54cde91d873341cfec2db9361e0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5724 bytes

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