Malicious PDF — malware analysis report

Static analysis result for SHA-256 d922dd1082e944f4…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 07:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c1ff187f61c880f99c8d5cbd4a06b5f SHA-1: 3696a087ca3ae8cc1eb5fdc9020b6db89982d0a3 SHA-256: d922dd1082e944f43d73ec1654175e53f505ceb00fc45c21c61f7e86383eb85e
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be redirecting users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

Heuristics 5

  • 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
  • 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.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921de472748---55884683140.pdf In PDF document text
    • https://kede.org/userfiles/file/3744952472.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/dobinenarago.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9353745f9---tinudatojuv.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16102df32bb80c---danivexa.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/xoribut.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/67497293647.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b98d6c4dc49---vejetozowexokavugi.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/46664854005.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb66241275---nokobijugoxujokewojo.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/tumubevikeritu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc0824950---limavajapowulusogeludux.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa907c95c82---43601896474.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/5964c33dac5cff38599b0f5903401a05/mitafejodexug.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5a70f67053d7f1bb1be8766ffd72cf7e/96421852285.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/83115588325.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/36037712286.pdfIn PDF document text
    • http://poliinc.com/upload/files/zokax.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be550fdca6e---vetoxudol.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/5379219148.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/rujuzokorewez.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/57591107629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=prueba+de+silverman+anderson+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 18904 bytes
SHA-256: 6f0f95c1c0f586f2f5269e7374f2e66b0706f7993597c63d55a4f20280ea4c54

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