Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d37af1dc84c642…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 01:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38e2762b68efdd7a24bf09a95e4c7ef8 SHA-1: c633a3be8f79287bd5bc45a07e3cf379b5c0dd6f SHA-256: 82d37af1dc84c6428f7e44452d2602a13d01c22946b3e5375dfbe8065c6178d2
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, and it employs a social engineering tactic to trick users into installing a browser extension or update. The document contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malicious content or phish for credentials. No scripts were extracted, but the presence of embedded URLs and the 'Browser extension / update installation lure' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://golf-tout-terrain.com/publish/page/file/61093790088.pdf In PDF document text
    • http://beastyenergy.com/userfiles/file/29635005629.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/38305942582.pdfIn PDF document text
    • https://stotex.rs/files/mesumu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/41965608790.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/pazasulapikiromojuvaroneg.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/vofofipirologe.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/bogila.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/beterikedatomumone.pdfIn PDF document text
    • http://roocenter.ru/upload/file/kumariwezorusiwinibedo.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/povefozugukil.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d0f2ae0376049c03437eb9318894ceed/biniwitekekuseberusabavo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d545a916---lizutafomamatirub.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/paderewesododuteja.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/13054267366.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379b9aa1f70---lisujimunurekufegin.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/48875778000.pdfIn PDF document text
    • http://holzweiss.at/kasivixubaba.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/jetupazikufelokozibenebew.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/xiwevarufawat.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/4111113550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=screen+recorder+for+tabletPDF 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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 17672 bytes
SHA-256: 39ec0c5083576b0ceb6ca9dfdaf43bae751488fc6f38a3c892b5bf1139242610
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 10424 bytes
SHA-256: f8d7435b6b0139abcf65389733f5f150dd64f4edf606782b16a774cc66060fe8

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