Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c650ebf98e05ea5…

MALICIOUS

PDF

109.3 KB Created: 2021-07-05 19:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9fbc401a0a7d3ca2d169b508d199351 SHA-1: f1346592a83f61d4fc5111b405113b29d106ff50 SHA-256: 7c650ebf98e05ea50640589907f2f0c4ce5b091cda47e5c92fceb9d2dde5be7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c0406623a4ebdeb3a20ff462de5f11a8/76970660565.pdf
    • http://mbcasc.net/imgs/file/17160052131.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea9245824---lafomuberebufibuximij.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcbb9cb96a---wefatuzetenapobakabiw.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/051723b91ce2ad5c7d0b6b1da628da8e/46503039176.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80ca5b489---3639606570.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091653b95e3c---nojixufitepabepikura.pdf
    • http://archerelectricsupply.com/userfiles/file/vusoje.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cvdhd41mbu0iro04v1nahjsalu/13161660734.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6af154df2e9355b69c58f5e44233bb7e/sawezibade.pdf
    • http://ersatzmonitor.de/userfiles/file/sojezex.pdf
    • https://anmimar.com/royal/userfiles/file/boxederutulajefutupa.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e118bbe135---61192626230.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/c7outrijpnrd1d7ma3eoeqt3ad/mabekupolororexi.pdf
    • http://boschvietnam.vn/files/usersfiles/files/43608935265.pdf
    • http://nutronicltd.com/userfiles/file/18931311493.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160897d3014e3b---43766884286.pdf
    • https://solidpractise.com/files/userfiles/file/timizesurepi.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff10d6ed9---55592110319.pdf
    • http://kccmaul.com/files/files/82975435695.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8965767cb---nelogutewotamevaw.pdf
    • http://perlawarmii.pl/userfiles/file/89369572506.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6794e780570887342a898c08f9c28a37/magizawojo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fallacy+of+a+single+cause
    • 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://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_off00014acb.bin
5dce9d4efaa3229816eab081e51b9771731fb3dd040d208582c8f1893ea5d973
pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACB 10504 bytes
font_01_sfnt_off000162d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162D8 16792 bytes
font_02_sfnt_off00017aea.bin
51d123a005feaf8e1f3a89eb15d50fef1c6400a8bd52681cd731c6f652a96d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEA 17296 bytes