Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed75b2098fd898a…

MALICIOUS

PDF

93.4 KB Created: 2021-09-19 21:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d84d52e18101127553657797f4c90f6a SHA-1: c21a64a54a4ec1908c251b108d752265a9055a9f SHA-256: 8ed75b2098fd898a766d152f6fd87169efe97d5d41ae137136027e3c563a9e47
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect to a remote support tool, a common tactic for social engineering attacks. No scripts were extracted, but the presence of multiple external URLs and the remote support lure strongly suggest an attempt to trick the user into executing further malicious actions or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://drafthe.ru/uplcv?utm_term=note+call+recorder PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0aca567cb---baxorefewabagodefaw.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/zusoxisomawipavarokexodaf.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/kodimajerisufipufevunim.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/namofulobawinaf.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/dakigojevowuxupulugowanuz.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/wisofotidiraxawi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/puroxuwu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea693ab40---nagapolukobubudiv.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///86738982953.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c1b7882ebf45a47bd0a38fcd62084951/julolotiva.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/24419233479.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/pefosoko.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/87181947253.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/7156820442.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/79420068274.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/sazaxofuxusomosovabi.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c94120cfbea482e5340fb740c575a115/pivejarutob.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jifovopubakos.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631335580.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesoxififaviw.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/40621899858.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/83878861428.pdfIn PDF document text
    • 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_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 18868 bytes
SHA-256: e85cce49fd401be387af5ef7fc1671cf9c87d921b6a843d426bb64c72d9a2efe
font_02_sfnt_off00015289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15289 9976 bytes
SHA-256: 78683c25e7eee9a67e1e3f04317021ee19afd6a9bf483d51e15848c4762bed6e

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