Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fc0177ee6619a9…

MALICIOUS

PDF

83.3 KB Created: 2021-10-06 23:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 68d19705a0b21d2bef891d7752dbdf8c SHA-1: 401c60094b68085d99297327bf670c04c987f9c0 SHA-256: 03fc0177ee6619a944aacf5dcef9ba1a763eebac679b9cf1adf5822ed909d271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=coding+interview+questions+narasimha+karumanchi+ebook+free+download PDF link annotation
    • http://kleni.cz/userfiles/file/zebivetonovozibigamale.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/kubokovobigebevuwimejopo.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/29148320962.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/kadebumow.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/db66afaf5a32716939b6df92a32ee7e9/buxanab.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139919307ff3---nofidagazusorome.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec285ee348---10064893885.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210921file///foxaxikopifapixogivopaxel.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/pibuvebesedajasuma.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/10570285329.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/33963294983.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/logojexodumibupenikoxuvaw.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/vunojisifuwav.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e588d149a8020e5d43d9a25c3d9fb59b/52033055862.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/gawesu.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/16504373124.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e38de7ca36---zajiruzawunewavusolu.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/71984794462.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/34224603359.pdfIn PDF document text
    • http://ocung.net/img/files/naxajimukabefezefivad.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/zolasafuwuzizekogijolunis.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/63221110063.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/doxuvipifugudapetuk.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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 11584 bytes
SHA-256: f26d6d483e53defb85d08206689402b7d649d5512d7daa77bee354100eae83b3
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 19244 bytes
SHA-256: 1547bb0433eb0991bce29ce6a6984c142d6596f3cdab90f1da0e6feee082a4de
font_02_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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