Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c6ad7646637bf9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 07:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f57e10b32e9e30420243cba26d5b21a1 SHA-1: 79fbb6e1e1872ce21a25be7ebdd4426b1cbaf8b4 SHA-256: e3c6ad7646637bf929e4e7021a291f7130f3013ab5fc6f151f08a3e0974ece37
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves directing users to potentially harmful external sites via a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cbb48dd51e2c89494a0f40f57f8538a/70395467184.pdf In PDF document text
    • http://sro52.ru/uploads/files/vabufopuxudumulemaxobu.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/3296860850.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210719151815_1850294839.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/008afacd49ed1d3fd3a246a2c9586ecf/65334995484.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/babomimoxaxonaxibalurumes.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/30789553578.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/vivuziziwanapuvosimoseruj.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f83bb430cae---96221947083.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/xewajunemekosirav.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/64942891564.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/jareseraraxomuge.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a02cb559ee---28259062372.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/69359590792.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765226930d5---zejewodusezujilivofimeze.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/80063604706.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210809/files/20210809075229.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zibijifije.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1df3ac497948e084a1d8ada96e64bb22/potafonuvodobasi.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/18150451219.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/89219073872.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/54022340224.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a931e26d2f5---zenunebedutab.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sagufalixapenik.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/winimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=steven+tyler+biography+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_off0000c600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC600 17144 bytes
SHA-256: 8e4790a38c6a71b731ccd9d07fb7824a895d9821b5e5ce011a9d4e77e6e1f332
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 11004 bytes
SHA-256: 458f627ebe93e39d00e12a89548d7f59bf4bc6fa73bbc6f609b2d42222879661

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