Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c072fc2d365a5f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 16:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 643c695901c6150eb49e4d15f18690eb SHA-1: e8ecf4b572ac5ccb5bc265d1e27a749a733aa353 SHA-256: b0c072fc2d365a5faa523b5dc31ee0f759cd7999fc2d1d531beeab854b8b272d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents hosted on various domains. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS upload directories suggests an attempt to distribute or host malicious content. While no scripts were directly extracted, the structure and heuristic firings point towards a malicious distribution or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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 http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/93861980932.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/017srqgoierpm3q2b9a5if77f6/nukazumujesexifewokagupe.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://karinbentum.nl/uploads/file/43906493202.pdfIn PDF document text
    • http://sivam.pl/files/file/10017330342.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/jefetodinamexox.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/77361327342.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/mivixovapexigakera.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/51412507971.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gitarix.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/67493054437.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7vqked75ags6gd269lj9sipch1/31723407163.pdfIn PDF document text
    • http://atlastoursntravels.com/userfiles/file/84994441652.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/kosob.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7h2fh0s27e8pic5golbkfvqs12/73190756224.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/6e7jpg4u6de2nuup8lq5uhp759/wopululixededizobevoni.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/66pui8i5jk657i38lguv1hvm6n/nasanozu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a141c4df21d---96778785303.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3b2c8305e---dokivugivolux.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b09e898d2---16299886777.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accfec5dd48---petazemanugijomogavasez.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/32565067746.pdfIn PDF document text
    • https://shidoremicrosys.com/media/30764228918.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4b4b47ad---40450971958.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085761cf234d---ruvobitujedufobimimikalul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mapa+ciudad+del+este+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_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 10384 bytes
SHA-256: acdbe8e59d619e844aa008e0dfd4775e1236b839e20bb763e2c561595b8ba7c4
font_01_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 23668 bytes
SHA-256: 38111e3c508fba28cf02b5494f3814797a3a1c983090f43a4da02b6f3e930c5b

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