Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f768daea6d831f2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 08:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 387df6e27d1c6d0df7f70022bb131708 SHA-1: 899e50a026ac65a3e291f82fab11cd64a2e7b681 SHA-256: 2f768daea6d831f2e0d5378ad5275c34c039173445edb311c46f517c1b452a8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=school+dropouts+that+became+successful PDF link annotation
    • http://beloezoloto.ru/userfiles/file/xeluzubijaviturapuxado.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/kezoligedusovezi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/abb3ba571b73ee3e66884e0a204ea5c3/67851712971.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/454978237.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a13081e80c79d347a46902d83cf9afa1/8205823167.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/51776511327.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/minimenokena.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/95984011098.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/46350606303.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b5449e981---29559116940.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eaa7200bd881afcfc03ae494b7b5728a/xupuxapi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094a991d297f---gutikik.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/8373746937.pdfIn PDF document text
    • http://netflor.pl/upload/File/58258892507.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae08afd36c8---21920459200.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/98898647761.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zikakadujilosurojujip.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/xukuturaxobowabow.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0d0293fb---47592871296.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/58928344705.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc3f9a143---mivosebitov.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t0k5h8rc55uj97le5uh7folji5/wutapakatolovekekipivozib.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/momaropakinina.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95e138816---zademo.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/28415741003.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0bb581501---961956545.pdfIn PDF document text
    • 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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 11004 bytes
SHA-256: 4f9188928e98377b92a4cab7c73f01ed47e0339213e28d6eccb17ee9d1a1c88d
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 17272 bytes
SHA-256: 33138a1cc3a141d3ee1c51334b2ee3b838cd6767f96ff7f78762345825d8f944