Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1e4b445ff28783…

MALICIOUS

PDF

129.6 KB Created: 2021-07-02 02:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 036da3b1dfe0b1a7067a1c12f0a87018 SHA-1: 9c059ec0f60f2dafea4e7219c91a9c0a8d85cd1a SHA-256: 4c1e4b445ff28783417d63a6c7f90a00bb11c1efdfc4b18303cac2a8dbd3cf4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4e93454cfbd631527e80e5e69bb7bddd/piruguzanaj.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1536982c9---vubalafutabu.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/016dde44395586ddc596c57d4b848c06/puwasupin.pdf
    • http://talleresjpg.es/img/file/fafojexigud.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/328bpns9563m6cg2k2o93rn906/7012576928.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cf3f7d311a9a4d6768a62fa94ee57dd8/69308422015.pdf
    • https://avgdesign.com/userfiles/file/kegurusomi.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607340589a93f---xulixapoki.pdf
    • https://pioneerlift.com/upfiles/editor/files/6822556360.pdf
    • http://bitite.lv/media/txt/122/file/badalivub.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16081675e5e845---19686065549.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f09a2393---zifer.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa94232d76---18401793700.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1b1c2d2a4f06345d66414c61edaca6f6/7223112103.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16227242696706.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e78c6acda3e86d6eeb92b2ae3ebff625/88001350746.pdf
    • http://adaviestransportltd.com/userfiles/file/saxenasud.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef3e14726---runum.pdf
    • http://riskhedgetech.com/uploaded/file/136599186860d32e064329d.pdf
    • http://guerrazzi.info/userfiles/files/39003965495.pdf
    • https://fonixkoncert.hu/upload/file/mupef.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/chqn6vr3qu3e9rvmo3tut0t537/borunefisimekux.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/832515741fd48cf1f21a8922350e0cff/96128739403.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8368c055---71031284516.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6c7df4e1ddb3f0bc17659b1e4154263b/tegimebupasisinapetafejez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hamlet+with+explanatory+notes
    • 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_off00019af9.bin
535e7a9e0c089b841db15568878299a2dc95dfd1dfa78a2ab88b913238eb09a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x19AF9 10812 bytes
font_01_sfnt_off0001b3b8.bin
8f4ce51f94dd08a6e19912ef1bf8a05eae534bb1049a669d1b9a7d4da2e8f7e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3B8 17204 bytes
font_02_sfnt_off0001e0c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0C6 16792 bytes