Malicious PDF — malware analysis report

Static analysis result for SHA-256 657f33a59f581779…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 990d24e9c7ba1452dfe217abff306ad0 SHA-1: b8e35b2cb01f9d1d14c2f0d2011deb1475a37af0 SHA-256: 657f33a59f58177938740489a3bd64af9b39352db9a63467b2fa1be38722a24f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b272c04584---17875968388.pdf In PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/h43g7d3qcsm7gkrq4dgiu1dgk2/valitedumumudozumuwowajok.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/pijededijeguxisoj.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/653a4776253b87ce2fbb90939a6d4390/89167452413.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/safemati.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/ruxaniwuvefetovo.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/48927860772.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/87190109287.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ad3df539---31605911513.pdfIn PDF document text
    • http://aimara-bg.com/userfiles/file/ronituwebixat.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/fadajuloxoduxedogazub.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/br58eo3bml6hncsauteid5teu6/53898679893.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/xidizewewa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a311e739fd5---63136732573.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a156e1ee3a3---94845228896.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3v7uog5jothvr5vi7s298q53vg/77492218886.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/likeketofuroba.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/un2b2qm17l6bgb9ssgmnajmdvj/mesezapopigumufurikas.pdfIn PDF document text
    • http://zuche0551.com/upload/file/pozufagijepejegaga.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/dd743b2bb1ab68c0c1ea5bcea61045ba/rijimo.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/19502182026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=marquis+de+sade+120+tage+von+sodom+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 22460 bytes
SHA-256: b2d36958c7950fbecfeedb039359f2a39fe2a6b2639df1993ce374dbd596209d
font_01_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 11396 bytes
SHA-256: bdb29fb3408977290b9b45c0bb6c74cce5def42e5d79609451817050322e56b2
font_02_sfnt_off00013aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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