Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24661ad54cedcd2…

MALICIOUS

PDF

63.7 KB Created: 2021-09-21 09:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80d5c2cd1dc1e4583908ea49e5114bcb SHA-1: a38236b866d75e20e95dbd3022c3ea240c81f737 SHA-256: e24661ad54cedcd21e197c4f1e8d0b2dab961a7a2931478851053409fda30117
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content, likely as a first stage of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

Heuristics 4

  • 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://chcial.ru/uplcv?utm_term=lucky+installer+apk PDF link annotation
    • http://geyikkimya.com/userfiles/upload/file/malovolubojilatekakex.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/87241617616.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/91193124784.pdfIn PDF document text
    • http://brenderup.ro/mm/file/2505091033.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/16558452068.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/95513456197.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/zomewo.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/85713128353.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xazomezal.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae24bef35---41475439085.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/vozezigidevikivat.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/mevukomezijagadegarisepe.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614708b1eb6b3---nomaso.pdfIn PDF document text
    • http://greenglobepms.com/uploads/86936811564.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/71420252057.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/tamexosoxi.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/warexekepujajemagutafalit.pdfIn PDF document text
    • https://aayams.com/userfiles/file/mavevukoledifujin.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7aeb3a5ec5fc3e10efbea43f94cd48e1/gavuxa.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/25835353259.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/86052080637.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/radigigugujozinuwujewod.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/jogewomuxuguruzubofifobar.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_off0000b982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 10512 bytes
SHA-256: 0d2798d699ae3bdade0e775dd93fcaa851e7e5659ae2b63a2ab8a6b56ef12f7b

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