Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5b68b2d4bd01e4…

MALICIOUS

PDF

72.0 KB Created: 2021-06-19 09:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fe65b2d213328766b80e4096ad6433a SHA-1: 632dff03385d42ec602251e3f3b68156d36db6f4 SHA-256: 8d5b68b2d4bd01e43c9d8c43df805db91a505fa4b6b7bdd8e4fac9541007d939
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Rufus install linux', likely a lure to entice users to click the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7314

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=rufus+install+linux
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/85611a5fbd9f96ae2cf3d20b4a890495/sejufokowurizezabatuwiger.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/882c54bbe45c4c68c21f14e3dfaae958/difozumize.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c966df065---jasevavedaxuzufezana.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a052062869---71986600067.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc9375906d---67835871853.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a687a259804---60030222325.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e86d8cd9f7032e9419f6846721fafccc/5532169203.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2cb4fc27566849568b2fb55f610b6963/bakavekirarixujetenulad.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d84025c415b30730e756627cd3c52e95/74317839691.pdf
    • https://tecnibat.net/uploads/archivos/zigolo.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/lujemu.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gn0jeg7uk3tieik084kjj72n9l/siduxabaniwirugopuzudefag.pdf
    • http://baaningdoi.com/file_media/file_image/file/36602960913.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b0.bin
ad6a63ddf6afe17683a864f7acf4140b82678a90535ab0506585f4e7d97f52fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 4740 bytes
font_01_sfnt_off0000f7f1.bin
b52780f0145d3f3e7aa1b0fad5ba601e0694667303949656bb42581f695d8b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 11464 bytes

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