Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fe58d84f2be794…

MALICIOUS

PDF

127.4 KB Created: 2021-06-25 12:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c21c37cf6a18d24805f4dde60f08b927 SHA-1: 2f1288fe6f04dc610dd10c3831ea460f42f50d83 SHA-256: 42fe58d84f2be7941fd99f637b3ccffc08c21b22ce6fe6ad1d35a680827ac5a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of these links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b2e30688---22360071578.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/somumosafepile.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4420e4aa8---vedekarerenipib.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a6a7b00c---nebuled.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1026e87fb---22694175809.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/kojejuvezelubobaneziresi.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbcee6b219---zeturoxabobesebezuganebi.pdf
    • http://foodchemsino.com/d/files/28405487225.pdf
    • https://akapacha.com/userfiles/file/zuguwufimapegavetafixux.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/b02jlt21jdte1kvf0p090e7ba2/48340851467.pdf
    • https://fanaf.com/article_ressources/file/72347062880.pdf
    • http://grupophi.es/uploads/files/407265741.pdf
    • http://limoride.net/gallery/file/fuvoxenafowefadona.pdf
    • http://kyanite.tv/userfiles/file/19498843486.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b13d5dac8b0a714d974209297b5f8fec/bugirepagebugedalowi.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4e6b6619---xanubepab.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/71335005130.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pictures+at+an+exhibition
    • 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_off00018405.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18405 16792 bytes
font_01_sfnt_off00019c1c.bin
2be9890acc383e4c3771ce85d2c8937502a2ec7153002a12ff9d8dea0ad34999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C1C 10624 bytes
font_02_sfnt_off0001b469.bin
b426f3164702784b3acfbd7a94fe9950e910c01cd570f423a78b178af7882255		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B469 24876 bytes

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