Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7d58367c94b687…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 02:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4e3aa81a595dbd48fa47cf8f0ba474a SHA-1: 46ad9853d5f77451a64615c93cec5322f021c6f6 SHA-256: 9a7d58367c94b6875a7462fea2b2496939aa276ae6d9f07cf99e928c5cf08b69
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable binary data, providing no direct content clues, but the overall structure and heuristic firings point to a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=side+effects+of+eating+dragon+fruit
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0baebf01b3---38453443754.pdf
    • https://aduanaldelvalle.com/userfiles/file/44787743444.pdf
    • http://trans-serwis.com/userfiles/file/radimixi.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/kmrlolm9i33udd1du4245com56/24069251874.pdf
    • http://amuseonline.com/absite/userfiles/file/jubibebiwenelu.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a2b2cd21e---2302340597.pdf
    • http://sjar-tech.com/uploadfile/file///2021052914511743.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/j6l35njm1n7u82d4hm0fd6msds/26904029712.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082420b5fa46---pamugo.pdf
    • http://szsahsh.com/uploads/files/7010808942.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f49379b18e995cae9bea1fac97cc4e68/9220833353.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cfbdccbab---50021770273.pdf
    • http://kapelski.pl/userfiles/file/85697144862.pdf
    • https://scheidungsrecht-best.de/userfiles/file/romopoxanu.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n1tvdd301nih572157tvbnj9cf/vuripatanuresutefepitu.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608365594597c---37563186641.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31c405140a1f4cbb1744080a7ad9bdec/67266402167.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa03a3bc1f---22968868604.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24481b103---53305565817.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a1a390a7---60700345612.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a665c5834---rojelinapirun.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/51d458ac80c9cba6e087aedd0d0170c5/48497267744.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210602_8AF5D33D0F1CBFE1.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087809ee006f---rodozof.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_off0000ea91.bin
6327707a713d15f457d4a6e3bf62c4b01dcd726c6a24eebd9c11adb570371c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 17012 bytes
font_01_sfnt_off00011665.bin
ddf25f10fe71f45ea35eba78e9f4bca4cc9a76130e5f0610481966b93b644f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 10780 bytes
font_02_sfnt_off00012f2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 16792 bytes

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