Malicious PDF — malware analysis report

Static analysis result for SHA-256 111903cef5997bf8…

MALICIOUS

PDF

81.7 KB Created: 2021-06-18 18:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98362528fab4848c93df8c8952b222f8 SHA-1: 6c6fecfdac4b77f8ceb98b8a914ef1001bbcb3ca SHA-256: 111903cef5997bf84f2b9206bd91eb916c9bebe9e6c219257c608532eae624de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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 https://ketchas.ru/uplcv?utm_term=miraculous+oblivio+streaming
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/53af41924db125780db5fb7b5a965f85/39456718805.pdf
    • https://usssecuritate.ro/userfiles/file/1057948903.pdf
    • http://promocode.lu/userfiles/files/vuzeranuxiwexake.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a876d9da184ef77bc2bc7f77fa538aae/34721704889.pdf
    • http://bearings-home.com/userfiles/file/rolajejunitevulel.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/ev21bjuioqm5vbnae02iv02cvn/52567989026.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9093ac5d---mujawad.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/db761c0617546c061363023e27204ce6/lebijijasobe.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4085fec4cedc8600bff753b61981cf34/dazedudo.pdf
    • https://bwawarszawa.pl/upload/file/mabamu.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1d266e73---33911547223.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2mmlf51515n872sihad6t4m4ah/16275796265.pdf
    • http://bet-balance.com/userfiles/file/3233890051.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/muwolutajet.pdf
    • http://tuzvedo.hu/elemek/file/vuxowovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9be.bin
17a1a3c9fc89d400f4c89413ad10628d186aa8d8a6c75f98678be4c00cd7cb25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 5324 bytes
font_01_sfnt_off0000fbd5.bin
e794dbda6c2e7b242a90c9e144570a2e380cd6a678bbc0cf975f716b0353fabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 13700 bytes
font_02_sfnt_off00012689.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16164 bytes

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