Malicious PDF — malware analysis report

Static analysis result for SHA-256 7551f6f4c02820ad…

MALICIOUS

PDF

103.5 KB Created: 2021-07-02 13:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 922487b04b952d15add4c4c57182913c SHA-1: 273e942f87faa95eebad2f76b71e97d65e0ca8a3 SHA-256: 7551f6f4c02820ad49ec7bf1b55f188997e24972c54f4fa748b1216eb3450484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious files. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple compromised CMS upload links suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a52c4226---widikutefesozisot.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed5d97f78---sogewaj.pdf
    • http://bakoca.hu/files/file/wisopisipude.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bced881cffb---10724149203.pdf
    • http://cs-golfclub.com/ckupload/files/neviwajutazuzumerofaxozas.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4lvf6an6k05p3uvtvjgdf00p66/kavositisesovuw.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f79552a18c---nujigux.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e317b4806---19447556353.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c69d04d1d7bf8c73d98386c9cafd3e1c/niwagiwafo.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52af2b042---ninilikezuwulazolo.pdf
    • http://lateonsettay-sachs.org/userfiles/file/24291216171.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887cd2c9b7b---27433773608.pdf
    • http://classicalgardenornaments.com/uplds/file/xorogusanaxubunezokokug.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e2711f20---wenozoravomesirod.pdf
    • https://camgloberealtor.com/userfiles/file/rogusibiwokudila.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/46659029260.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/vuvarofemopolovevudilita.pdf
    • http://pogservice.ru/userfiles/file/doberiwatosikekumutupe.pdf
    • http://christopherdallo.com/file/kalor.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1853a55f7622368763ebd5bea779c261/15061410766.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bccc67c3---ruxilexexepuromeda.pdf
    • http://younewstoday.com/task/userimages/file/35921398482.pdf
    • http://modellszerviz.hu/userfiles/file/tifef.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1f61b4d1---41610137181.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/fe0e9cb798bb3827b409171237664825/57205597248.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c01381be5---winetananorodawaji.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/ff0151fe8983485502240e32623ec378/89659859269.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=barriers+of+business+communication+notes
    • 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_off00013336.bin
d1b4c68f7b39ed639fb5e73e3e2c29c98e75758d4ac08f5e2b22d13ca56b0140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 16948 bytes
font_01_sfnt_off00015f74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F74 16792 bytes
font_02_sfnt_off0001778b.bin
b18bf99972d4011a6b03dd74c7e2c365fbecf28224414a1eaa4d07304999c201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1778B 10744 bytes

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