Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e23b6661d0f4d2…

MALICIOUS

PDF

87.3 KB Created: 2021-08-16 11:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86451410c43e18e478455f8c334a45f2 SHA-1: f008601096d461a94c69d841e3acef6d2f3defee SHA-256: e9e23b6661d0f4d2f2ca3e1bfb7f375fef8a81cdfd8b01c24aca2a323910f942
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://luminex.pl/upload/file/lomexi.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/m62edicp0t86j9neam68irn2ah/66746556040.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/80712307271.pdfIn PDF document text
    • https://ancoraeducacion.com/images/nanezivanomajafe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdea828b2---bisinawulirawabak.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/87652897751.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/40322326266.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lvnl2qo1cci3jbf6gcajdaod06/xexifetom.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/8858365054.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8977abb823640ca7b1d64a9d80d102f4/44039112363.pdfIn PDF document text
    • http://cmtsport.com/pliki/wejevejabuluxovifopun.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b6fb30cc0cc87d0e1e8b20407c5952b2/75948750969.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/42404959203.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210709125806_moll6z.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2e84597df---kokolinululevibewitomiz.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/10689603562.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/iicrvsno0q153b8p8rj379a6vc/13089422023.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d91b1cdeab2835edc3f7e0997caccfde/tewinugabidulapuxotes.pdfIn PDF document text
    • http://djapm.com/userfiles/file/wekitizudavukudazoxo.pdfIn PDF document text
    • http://veitali.com/upload/files/mosaluwavop.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d76d88256168606b19455bf14821b36d/jurupavozokajufe.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d66147893---92045376734.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7702b11cab---26191641024.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/43ba25b4a8af004c9a0cf62c455acd19/momodomupanowiromu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=costco+kirkland+spiral+sliced+ham+instructionsPDF 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://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_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 11000 bytes
SHA-256: f76c102ad28c6bbd82523baa9b9e878d3a5742296b49959d687b828acd84019b
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 18564 bytes
SHA-256: 5489b0aba74e8a107f7b2014f47d278dad2f0dcc18d572ff02e3a1d381a5fa8c

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