Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c23aa342335d5f4…

MALICIOUS

PDF

97.0 KB Created: 2021-08-07 08:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ceab7c3068d6a40ba6d3f3c7650f323 SHA-1: f3f9dc9e7621f87ed04e26dbf2684b880ad23d70 SHA-256: 3c23aa342335d5f455592dea7452f6832234b09cdfaadc011755ae79d2a48f5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The primary attack pattern involves luring users to external sites via these links, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ac588rdu7lmlohdm6nuvcj631l/lodiradobut.pdf In PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/23e87619f65f66329625d7ca329c2093/satisawifowasovasomigaro.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9a4702d2c660ec5a5e8d0068bb91d295/renexoburuzuwuxuvapezixis.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/91614544683.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/13730050401.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/muzewatebajebebovulixu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/83da51e366da8b7346a23d99408b10aa/26703569210.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/89rj2o78ob1kerslednpl22aa7/67020122586.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/xotarifejedid.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/29d4e1252e449753ba4c4e39f68328b2/81984974177.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5cfdb189f---18643710263.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/837bc0a22fc96d2c1764d86c43cfa8aa/89316643920.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ab0f65e81929c8a94bba49f60a24a40d/68368824811.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/panexope.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/lekositawezivo.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/betowokevoz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/965d8181d298006a450a96666ac41381/31598975487.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608330022be18---zapivagipajid.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/2806834930.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe4c6f901---10134852120.pdfIn PDF document text
    • https://jotelek.hu/files/file/loguveriduwi.pdfIn PDF document text
    • http://zuche0551.com/upload/file/65523184062.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/80688516981.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bfeda70db---99992539722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=latest+android+version+for+galaxy+note+5PDF 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_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 10900 bytes
SHA-256: 1ab7cd7b25ef83a756c81a1c1b2533abfbfbd4d128af8cdecd9f18fb0b878787
font_02_sfnt_off000146bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BB 17508 bytes
SHA-256: eb1e39ddcc0c4c35851eb78691f5226fc91cc4ba197e0bb61ce37a090092978f

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