Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef5634b3ba71129…

MALICIOUS

PDF

88.4 KB Created: 2021-08-07 22:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c632b82f8a29a971d9ef4e378eaca740 SHA-1: f25c2c6141f1432e88e757fe74580c51061a9932 SHA-256: bef5634b3ba711294cc46258c991c1589b0079b2f252b3e704f0049c048d01a4
216 Risk Score

Malware Insights

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

This PDF document impersonates a cloud file-sharing service, a common lure to trick users into installing malicious browser extensions or updates. The embedded URLs and the ClamAV detection strongly indicate malicious intent, likely to facilitate credential theft or further malware deployment. No scripts were extracted, but the document structure and heuristics suggest it exploits PDF vulnerabilities to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://smidgel.ru/uplcv?utm_term=after+movie+google+drive PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0b613f8090767dcfe968df57acfad4c9/nolenuvosuw.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d80b59b9a---laxobewidamutibadexizat.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/at3uorcg02f6844ja31sfcuhlh/73973553477.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/menip.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4361fa2bd9---wipobutozolazesim.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4356bd4b3e---tudakogibagumepo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/81040466096.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0fba6271---vurabivun.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210526191644.pdfIn PDF document text
    • http://plncse.hu/php_data/file/34844853460.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/98482206086.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/3650c2aff3d120e7cdd4fb0e30483d7a/26325181691.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e5365063c127807e0797b9a797290474/88408614292.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f6800a04---lonijelanij.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4daa797eec7f7ee3952babcb71efdc1c/21190305969.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/rurobuxetosafakiwole.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8f393785---dogotumiriramebupajeto.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609145a640987---81170407361.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d1b9c082---tazumipulok.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/fejijuxozibuxarizava.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16086afef58440---65792206871.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606febc5dca9a---dowore.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/40029801282.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/38969155439.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/85767993707.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_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 10312 bytes
SHA-256: 865332d98e0cda71de4dc9a5df8b75368a6a46b2604444161b542a5d8de1bec5
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 18796 bytes
SHA-256: 18fad3c37269ea5e912e9be77e3ab4434bf710fd1a7174242c6f6b558c4181b4

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