Malicious PDF — malware analysis report

Static analysis result for SHA-256 347725b1b3d1f69b…

MALICIOUS

PDF

85.3 KB Created: 2021-08-19 02:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c98d90c3fead3b392e0e7b2f3151f205 SHA-1: 46c23c12bbeed172c19a174f893274dac4177f0d SHA-256: 347725b1b3d1f69bfe462e0149242b786b6dfa8e9eab091ceb0c0c72462ff448
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eldmsh1.ru/js/ckfinder/userfiles/files/bejadelu.pdf
    • https://atlantidegattico.it/file/milutamazagivuwugako.pdf
    • http://lucann.com/Upload/file/76934543521.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8731c288a---2335216156.pdf
    • https://ph2020.org/ckfinder/userfiles/files/wisaxuwejof.pdf
    • https://bodegoncriollo.com/userfiles/file/fenulumifibak.pdf
    • http://markone-tools.com/upload/files/12921779048.pdf
    • http://ebslang.net/_UploadFile/Images/file/36200593400.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/87133178742.pdf
    • http://gojjang.com/uploads/files/12657604942.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16110424753e69---lukigelole.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d163ab460f---72243400625.pdf
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/84316373645.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d760470eb99---livafixitovoba.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ae6642cc---megoka.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55df4dcaf---36324174254.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/larowunixubu.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f846a0fb---xepitirapu.pdf
    • https://ivanamihic.com//files/witaguxufavat.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f77e8a028---fewox.pdf
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/nejezunogemavizikanuvep.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f9d95883ac7ded17902b1f3f47b2960f/sajumarofurixibegaxis.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608759708052d---fukukufujisuvojed.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dp52abmo2nl4ark901tokqtvh2/bigatanus.pdf
    • http://sushi-belovo.ru/files/7046457635.pdf
    • http://www.tokyomagic.jp/images/library/File/lagawimomezonutixeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ares+virus+mod+menu+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e072.bin
0e5d089f5de3b0eeefe27e8033b78b10e8c2b118145978a6e821de71b245a8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10648 bytes
font_01_sfnt_off0000f8d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 16792 bytes
font_02_sfnt_off000110eb.bin
9b226bb1b2bc7aa74306666bf58592cbae48218abea3dd99009faf4475a28810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 17628 bytes
font_03_sfnt_off00013f10.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 1692 bytes

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