Malicious PDF — malware analysis report

Static analysis result for SHA-256 47617ab4c6d2a451…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 02:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 431e4134da19b82c53ed3faf6ad8bf54 SHA-1: f415204289adf8a1f52f22a8f31beb2ccb909698 SHA-256: 47617ab4c6d2a45104fa2a189077619af78c1a1304ed3caf56e646b35434fdab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious document behavior.

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4baf058f99---rutofotozux.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c564a8161---dovexagokotirebelesug.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/45434616373.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d587b4c62a---83930480008.pdfIn PDF document text
    • http://didopack.com/files/wukilafufux.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/11848471759.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/durebuxebakowopijazijove.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/14784649237.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/8343685644.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/27909832659.pdfIn PDF document text
    • https://soechi.id/userfiles/file/fejodugegebibojo.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/26772460888.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607671dd8a544---tefebuka.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vck31b97gq1qpqqmdluvh148vn/52314001386.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/8198022829.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7343efa86acab68355baf400285477c5/vakudibiwaxenebagajijixu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/86985924970.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/gozafukijivaxapimikes.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c10e323e9e956d739d92df88bb6c58d/73369790422.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/78422663005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=supernaturalism+in+kubla+khan+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 11048 bytes
SHA-256: fdd5f571885814d3af1585b6553eb5ff5fc65176ab5df8e95d2610686d7eabb8
font_02_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 16804 bytes
SHA-256: e7a40530f15c5989bb36f17ba071127340f354f6fbc1ba4b07de87011ffa473f