Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92beab0d9e99b42…

MALICIOUS

PDF

175.0 KB Created: 2021-06-30 22:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9bbf9a21c661621f912543048186fd7c SHA-1: 44278dfc4db1495b0223100c2d1b90169fbe3704 SHA-256: f92beab0d9e99b42b8d8c2bab96b5e807fadcabe27878e9549b7a7bb5d81549a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5694

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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/v42j7g56rfie5k91vv9ceb5eoo/57178604595.pdf In PDF document text
    • http://zulassung4you.de/bilder/file/nobivez.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e67580094f---lawawutotoboner.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/nusifuzuw.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9930d4e15d4ef53cb4c27d1e3db00d8c/96807146395.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0291f8f4b44bd4d93d9a71c612ae511a/14900570980.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23fe58c8e2---98615582937.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074af612055f---32363190352.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9e32s6ig4leen58nnd73u40vi9/91706431917.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/javixevabenunejej.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d0a267eaf23d08e9b65188be867d0313/lubabenejonozurobo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/gotagibupa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c83d6c89b5---jadifufenopug.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/takugajebuvememagoj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5edc35d56---rudisir.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf552be822---48707703240.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9ebf52c101afa408820971ec37ed4bc4/29609567573.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/103marnef477m1vp6c5s5uctkl/78794015778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=handbook+of+radiotherapy+physics+theory+and+practice+pdfPDF 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_off00025865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25865 20000 bytes
SHA-256: 674b0c8a1e6062e7401b4d2885823efed453c4a006d11f8c9226044f6664cf80
font_01_sfnt_off00028e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E11 11008 bytes
SHA-256: 39136072dd071111fc7e96a180618fc6267fd6794932b42efedeb1c37339e50d
font_02_sfnt_off0002a75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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