Malicious PDF — malware analysis report

Static analysis result for SHA-256 c822d3aa0fcb433a…

MALICIOUS

PDF

88.3 KB Created: 2021-07-19 14:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a70a57c44c67927f63a8ab7f9c8a252a SHA-1: d1d4b899270c0f1a424bc2fe51387a129fed7595 SHA-256: c822d3aa0fcb433ad00abad98d8e064cd930a073a89797282a345b4241d4cc61
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to lead users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bangtaisay.com/uploads/userfiles/file/dunavevoliremowiguke.pdf In PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/20864257313.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608722c63a26a---45556832138.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9aa34d8a2---2385569449.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/18d7vg21c172ivombus7bqsmo1/fitugejimudiguguguzeronut.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/886691be3c256b234c7246abf77597be/tarupegoboropewexodofak.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a433d181c7---gajazuwezadala.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/95713955692.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/puxigazim.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vararowamibotefulowozon.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/d8e0c2cd4300e3d19fbd871da33aee9e/89611038375.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/wigovodejukesopexino.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/masoxubewetanimolo.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/28623394866.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6ed1ab968e0b6362419b56ce01dc09d1/tupaxigikupuza.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6474229bca---5193367309.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/fh0rg4ocjakq5o1f6mh7bij4g2/70132690047.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609846bf313b3---miwenuribo.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/58046947393.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/attu6ql650f29m7pa6j90ang7m/janurababamukusej.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bqqasq592mp5kqi66gffc06rq6/gebedusowa.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dbe3fece---317690200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=honeywell+thermostat+manual+rth7500dPDF 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_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16964 bytes
SHA-256: 584c85dd1ba84cfea76bf3885cfce614693266062cb8bcd9fed9021567580477
font_02_sfnt_off000138c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C2 11020 bytes
SHA-256: 5312ac8c2605686e34cacfcecd906a60c96d56360b6aa719eaf3fde3d5cd6876

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