Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c3f3c307d8cd02…

MALICIOUS

PDF

94.3 KB Created: 2021-08-07 17:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc8c0d061385a524ad361747e84229c5 SHA-1: fe7c04fd5cc6669be7492eaa567c73248eb6506a SHA-256: c2c3f3c307d8cd027e43d07ddf44754d6749d4e033f480b56ea712ee8a7edc62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious File

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to phish or redirect users. The PDF structure and embedded links are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://burelomdo.com/ckfinder/userfiles/files/36206137800.pdf In PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/14543292602.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/pusunilezanoxalenenizalir.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/15259294476.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/wexakenula.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/borepunof.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/damurupetodit.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/muxobuvuwanuj.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c63307643---69004408487.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210807123351040.pdfIn PDF document text
    • https://eternalbliss.net/file/44725934977.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/zemimafaxemolow.pdfIn PDF document text
    • https://zold-kommando.hu/files/zalikemibalelafapapobomag.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7a30be1e19c1719b3209f2c98c17c34d/11853927510.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/27912700253.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/86484549711.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c9aeb99b---55279220736.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3l9j2sj4bv725vu26ffnakdtpb/5806827262.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/saxanowunakisunajorovej.pdfIn PDF document text
    • http://paliukenas.lt/i/File/20200928937.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/55188223699.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bceda22e0---61593125912.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/856c9f03b73a96b2defc44d90de1c509/15323436926.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161092e9c5c516---33973416153.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/871700f909cce545bd787b34318e4577/51450760389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+to+include+in+a+fire+evacuation+planPDF 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_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16832 bytes
SHA-256: 3975158cee4121f06e11d59d075cc098649d49f4fd077f4024071852da9c780d
font_02_sfnt_off0001529c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529C 10708 bytes
SHA-256: ce14dc6a8758453ddb1daeb636f5698b83003db7bf96a66cc83cbe7c0aebc424

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