Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e23788372841259…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 23:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38941b65a0c141deba57d311fb1d4d05 SHA-1: 9687d4714499133f943221823db8d3b528b3f159 SHA-256: 3e23788372841259a96e3e2592d3f50582d245dd3471dce05a61bf0d25b88167
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=code+vein+cathedral+map
    • http://uniroll.pl/user_images/file/jarirarosukez.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9114893a77---76395702121.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a722e0250c---nezumutaboxot.pdf
    • http://valdhans.cz/userfiles/file/93826337726.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/d83l0f3l2ugck3mttaq3do76k9/vetirupevifa.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4c6b82da---87656841863.pdf
    • http://cuacuonanbinh.com/userfiles/file/wudul.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee3443608---37130454107.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607655af036d9---5192320205.pdf
    • https://pakistanchristiancongress.org/userfiles/file/nutowon.pdf
    • http://doks-films.com/pcms/content/file/64357639587.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0a467d9a---fevuwor.pdf
    • https://bestcoloringpages.com/userfiles/file/90108123815.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce6cd445e---vijofupajot.pdf
    • http://msamerica.net/clients/873634/File/97174686651.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c19f587b24269f9dec061ef9aa1f8936/morawirabakagukivemobed.pdf
    • http://amirafouad.com/uploaded_files/file/laxagige.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff5.bin
031ef0f3fd739012e71c4ce848370b6e0346eb413f7e9eca3366adb1ad4677d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 10708 bytes
font_01_sfnt_off00010855.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 16792 bytes
font_02_sfnt_off00012067.bin
f6ef2549f82db29f64ece1cf53c7142d2cbd55c9a0b1a145901765046eef0539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 17520 bytes

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