Malicious PDF — malware analysis report

Static analysis result for SHA-256 789226fad23adb19…

MALICIOUS

PDF

91.9 KB Created: 2021-07-04 12:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 622b86853070f1ef3f686b6db6c86171 SHA-1: a212fa82d3a9032f4323675f752247d1074d7dab SHA-256: 789226fad23adb1972546726c239f3c59906a31dbc14a3c702e14ce034dc3a18
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b1761ac465a61a20b5cd37952724d5c6/rejujizulujefovak.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a715cb2e---72699500173.pdf
    • http://grimastone.ru/files/14826925365.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eed3ebb2b22d93a8e1dbdab23c4fbaa1/10770634728.pdf
    • https://go2germany.ru/files/file/zekimewuredoboresofilan.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4ba0ea2e2e7a8e3dbc2748ce58bae9a3/9168017104.pdf
    • https://soechi.net/userfiles/file/zavupudazo.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/kkvqqru862pnfra5njo89mkr53/vonem.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982be9e7458---dosijutefavugafikejaron.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/54244413105.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/6427e4d4d4815bf09e67fb29b015c3f6/zatenufadujugamakejifowu.pdf
    • http://asja-doll.ru/userfiles/file/najabelod.pdf
    • http://kadh.kr/bobod/upload/file/zufulu.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3e88163ec425de870832da656988da/95159473706.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kol0u9r49cc1hhjhlgbgas5tl6/57284061929.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab145bd6fa---72984655999.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/l7ihopblieo95b31m2gunr65kj/41034226614.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4dde9ecc---69627120173.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073706aef305---zuxofa.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d30d40c95f083086abc0e9861f5ec70e/68141712314.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16072807f9e646---82190007338.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16094ece00e55c---53253953488.pdf
    • http://nfc.soo.jp/file/bexutosagujotufiratudag.pdf
    • https://edbcagliari.it/file/33342200792.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d4e25aa94e8a97af05cf6fc6bf904b5a/kudigu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mindy+st+claire+the+good+place
    • 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_off00010218.bin
ebd2dcbc67d39c254a502f9b96a026e20aedb2ba78d9f4c5f92d5a77c10476ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 17664 bytes
font_01_sfnt_off00012f92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 16792 bytes
font_02_sfnt_off000147a9.bin
b0afca195cdc8eaff79a26631f2c4f13e07355d69f1241a44eef8841e992ef99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147A9 10900 bytes

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