Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d14e9b0734fa1b…

MALICIOUS

PDF

91.4 KB Created: 2021-07-05 07:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9247de4d731b071ac732b9684b30d49 SHA-1: 8a97423994322f1560d094eeb136f4fac3edd399 SHA-256: b6d14e9b0734fa1b4e9b9dd782c37e00f6855e78a659a74eb64fdd175625b483
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used to distribute malicious files. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing attempt designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee90e0a98---7338478473.pdf
    • http://stlnsk.ru/uploads/file/43837090228.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b32763d65e2ce0d57a9175c7691b56ae/bumazizagabexi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e836beac6---tajisatosugowuwujuxogofap.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c15e15bd3a8559327c10460100f138e6/34884964438.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf78263da---livokapifab.pdf
    • https://kovtec.pl/eurostyl/photos/file/2301345611.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608846ef3242b---72639923605.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078667cadaf7---43876640131.pdf
    • http://phayaotechno.com/UserFiles/File/pifanubosoro.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090103732ad9---46621261371.pdf
    • https://foundryindia.org/userfiles/file/73598278121.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c3692fda829---62735587865.pdf
    • http://moreit.ch/productinfo/file/liwirirozovonaka.pdf
    • http://hochrainer-elsner.at/upload/files/87593791237.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080741063339---zogololafasigamomut.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8b7bce99aab86ec59c5a6105c3f05ad4/gudikugejiganoguwire.pdf
    • http://fotocaroli.it/userfiles/files/40695186989.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df455296ddf---46833762468.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1aae630bad654579cdc54b60abdd77f1/tipawegepotu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2692f8efc014f7882c754ed5a5748fb6/563946078.pdf
    • http://computerdoki.hu/user/file/73130717767.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hbs+sickle+cell
    • 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_off000102fa.bin
580589b7b6c4f66299e4ae7064881778ad88da0f622b6c6ad4b56cdc30aabee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 9864 bytes
font_01_sfnt_off000118c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 16792 bytes
font_02_sfnt_off000130d2.bin
e98cb2a30f538f9e4c996da223543ffb15f3076994b3363687b17378049dae6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 18272 bytes

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