Malicious PDF — malware analysis report

Static analysis result for SHA-256 55233c9066fecf04…

MALICIOUS

PDF

72.4 KB Created: 2021-04-29 12:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e9071345605e6bfc197e43d0ae8f960 SHA-1: 3815d4f9fb29811a1970b579411dc45856c055e7 SHA-256: 55233c9066fecf04f4f0883d83f5c389511fb1eb3c619c6174703349df460791
96 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the links suggests a potential for further malicious activity or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0c7f420a---19049749539.pdf
    • https://a2designbg.com/userfiles/file/46940372697.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e73dad9a---17570949897.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1e71cbde7d5491db86c1f5c505828e4a/megefojagub.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f0b9856cdb80ccbf929372d109b424af/zedurudevawazufezoda.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dc83bec9f831fcb68c35d14c7662fb3/binaponodokolazepaw.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759064ae6bc---vuneredapoxiv.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072998335cef---lexipiwu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/136a1adbbf7aaa120701c080366ad3d0/81899656204.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a27e16b6e---96237882889.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1sf9hjjrio8cm7qvg42r8f9p02/nesujodadijigifibilus.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91512254313ef427633d1abfe9781ef7/jatupafaxarota.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/03b7d28cbe4b858a68d63aa18feedb72/rexuxijagabudakizakodumuf.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/70c0d56df7c407a51c0e0d8084b2e2fa/vogatamum.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3dba58d83---wowid.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e790b0936ff6406108da3f179711d009/17318850548.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+lateral+thinking+puzzles+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc8.bin
4850b13f24f5cb8a11e9f1dc8daec6fd7a5d21a49bf2e429fb1fd5e691e193eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 5336 bytes
font_01_sfnt_off0000f003.bin
91dd3c5cd72f198e7c81aa14779a7945465ed9fa4cb3358c2522095092833a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 10504 bytes

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