Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d9f631f10c8d83…

MALICIOUS

PDF

88.7 KB Created: 2021-08-12 05:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76622ae04793fd139e8185a8b9583fa5 SHA-1: 761b5eacddc350c7c8f8d913daa9d531e1e15b7f SHA-256: 53d9f631f10c8d83de5dcf528f8968f65a0c2c3443caa0676ba77da9dfc9f1e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to potentially compromised WordPress sites or other suspicious domains, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/38e1e00dd639d619832b90540433af67/zabadovunisuzisozoxag.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ce9763b13e448a358182c9c14f99735b/8528186533.pdf
    • https://vv-alc.nl/uploads/files/48401516809.pdf
    • http://maybomchuachay24h.com/Images_upload/files/31442259262.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27938498f---24521503183.pdf
    • http://newbiesites.com/userfiles/file/84771379325.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a67a8667ed---25649521983.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62b6153f9d---78370300292.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7bf3f3acb4357079657b0730a46db6b2/zofonebowale.pdf
    • http://saluteebenesseresas.it/userfiles/files/26760754619.pdf
    • http://www.prieteniitehnicii.ro/documente/file/30964586337.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d471e40ccf---50348165776.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d05d30156---88367168976.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609952b3642ae---31451921724.pdf
    • http://dichvutot99.com/webroot/img/files/welifolonipumogitufufugol.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0c75ee920340d2ba6543e30915d4c77b/30102094859.pdf
    • http://smartpaintingplus.com/userfiles/files/13173735365.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=las+parabolas+de+jesus+explicadas+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_off0000f6e4.bin
2b8bd1b7d41a77170ed57de5e39a9489bd5584a264f71eb881e9724a0cbb612d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 10840 bytes
font_01_sfnt_off00010fcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 16792 bytes
font_02_sfnt_off000127de.bin
704d8f08b9d37d38ddbbf66d31d9f7292256c239e09a8697cbf9426d29c2be42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 17836 bytes

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