Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e9b2227b61a20c…

MALICIOUS

PDF

105.5 KB Created: 2021-06-26 00:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 154229570d4f5c49f1caf7d101fdb9b2 SHA-1: 128d71f67066fc14033e47b8d8af5de75fdc4351 SHA-256: 42e9b2227b61a20c9554dddd3aa71d2d945076a7bf2eb84d754f26ba6b19baee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The presence of these links suggests an intent to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://codecs.ro/images/file/ruzulizolowagud.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5201c55e4---91367883944.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079c33a4df0e---tefijow.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/0c8144996ea5eb6351c52e392c9300bf/78020456614.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c559dbe58---20962704747.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/137d6e1eb08b5a04eaaacff280dad82c/noximotatositerifax.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/46d6c39f8afa9ee20d2abd3d3793eb52/96266647786.pdf
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/kozubewunutigapomix.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609443e31618f---jepoxebanujowef.pdf
    • http://ciskmv.com/css/file/60833021595.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c27ef0ca88f---10853309123.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ungpjqeqh9ub7qgt21snmeaqq5/8209212890.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9a8b5850---nipokukutenenonelugurofu.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/jegajudinobodogaba.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6bls8p9ci6rrp0v5r2engmmae4/38615580769.pdf
    • http://czdashan.cn/uploadfile/file/2021042821054973499.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/380fa074fc68007f51689cb73aec883d/55327901954.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bbe57075fbe0062dbb3a01388e00393f/90282796834.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9260311c---12147509908.pdf
    • http://inventory-acepipe.com/images/uploads/files/delemiwar.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914ec3c17---95900136010.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f378c45960ac9ed0c1beb2063335674c/81974614670.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=good+to+eat+palatable+crossword
    • 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_off00013879.bin
a6c04b5606be9fa24cc8b4df84cbad0f80e83f67537dcd82e1d89f4977483354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13879 17836 bytes
font_01_sfnt_off000166f7.bin
64c06390ec6b8bc9fc3e50649814a9e7ee3983157fb7f1ab0a33ab7b3cd9325c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166F7 10576 bytes
font_02_sfnt_off00017f1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1A 16792 bytes

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