Malicious PDF — malware analysis report

Static analysis result for SHA-256 695950bde9f28752…

MALICIOUS

PDF

88.0 KB Created: 2021-08-03 23:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26457402c4fb2191c718259f2063918e SHA-1: 0d0fdce43abd2b5ab090640c5b1c3b4fcecb6db4 SHA-256: 695950bde9f287522e1788523580ca76dba4cfec21eca5cb380fd957050cbcbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple domains, likely intended to redirect users to phishing or malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure the true destination by using numerous disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=uso+de+mayusculas+y+minusculas+ejercicios+para+primaria PDF link annotation
    • http://bannails.com/fckeditor_userfiles/file/72926227067.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c33502b8eb2---wikaxefevetugamo.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gelasafegirunugiwexupa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082688a646ff---muvaselisamepubeviriweja.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/vubozadojuvolizararipupa.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/gelope.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae28865334d---49940023074.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/44931414440.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/zokixexirije.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c57d6014d2a19a20893ed2cfd2c99ee7/xoteradegavogimudigasi.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/48374824484.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b932c9981---56400688476.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d07bd29da2c---29837005490.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3b408bfe5345ee8938070cf806183542/29659530559.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/86449493586.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bb73f5e805aaf6bcf124223027fda27d/jabirepibazavuboge.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/ziwavozenifan.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/24115403874.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/30236727567.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/vosomik.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2jsq8ka4321kgd88lqu76sfecd/27934671252.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/oqhablh5upaepgi1k4d1osaq61/xudimopakakafokekop.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kuzivowulomovamedanimu.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rilisot.pdfIn PDF document text
    • http://allycatering.com/userfiles/wizadufimewitu.pdfIn PDF document text
    • 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_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 10928 bytes
SHA-256: 8591f8d43f336f067d161072ebd57fa32886b1abbe888659f867a068d4098dc5
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 18252 bytes
SHA-256: 1a49863a83acc03790e841c4398f1cdbd114f7176c57f772f69f9e9aff611cbb

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