Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd935e3ef4362ee…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 04:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e07634d41b820a225297831abc49472 SHA-1: d55fc6aaa46184f640f7a90ee55cc3a023340aa5 SHA-256: 7fd935e3ef4362ee3b26051e4ed30d3ebdad55c42ea3333e589b00a1b6c2d3cc
196 Risk Score

Malware Insights

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

The PDF document contains a high number of links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a browser extension or update. While no scripts were explicitly extracted, the nature of the links and the lure suggest a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c57f4d08d---nelimaje.pdf In PDF document text
    • http://msamerica.net/clients/873634/File/36211283196.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/jalalone.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c1a6d21c9---fawax.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/94588817308.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/nazabumosoramapakasavur.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/fuzerizidonevubimefux.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/xifemud.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/38985226350.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/45212663197.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094996ba6da4---kodowozifosirupasuwepiwe.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60024786556.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/36967550596.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3215024c---77508969039.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/farovonavusada.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e990cd0170---rofasetewudejesow.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a157075cd43---nigezabomixe.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fd7633c3744dcbde72a27a2a732ced0f/venubazojelived.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90b181a40---17699335750.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/xaguvaraxupujobiwig.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611abaaae21ac---77883429673.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/jikilojijat.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bukavisisageximejiwejiraw.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jolujugazesidivov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=isp+throttling+twitchPDF 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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10396 bytes
SHA-256: c0e3e3ef75b293eb21d2bca57b2c9207944f0e32384a825bb37a9f5f3ab96697
font_01_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 18484 bytes
SHA-256: 2f52ed70d430ddda3ec587fcf72e0d80010024cb9f7888cd838848d15ed134b2
font_02_sfnt_off00013831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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