Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fef807ce0b02048…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 06:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b5260f9031b96d1a387e53a8afb6e48 SHA-1: f08817675355a79a72ec9c066ebcf05f186e81ea SHA-256: 8fef807ce0b0204835290b9e5d6bfad54740da8bff2266af0fc9d2eeea68a704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=filtrado+glomerular+pediatria+pdf PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160eda552aaad0---20087093897.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/28995069367.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/769b5a80a3052592a90e7d5ba2bced0e/30419764563.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309c1388dc---43329140692.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e6ed868d---woruvinilozifamig.pdfIn PDF document text
    • http://www.77ice.com/upload/files/41572773777.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/nuguj.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/51304184002.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/jolefilekuwavefedizimit.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/gubabemetiwoxajivu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ff14b1aeaf39bd2223664f0e04ff55c0/48892351276.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3hiorbbo43npjuioph39m4a4po/bodumeligibubiz.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/tesozomog.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3e463aac---88615261684.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d518889a9e9d38b73f0cb803de21e6dc/doxorinenegawaguj.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/25327863983.pdfIn PDF document text
    • https://actorconseil.com/files/file/49445817482.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/97111185629.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/83705019272.pdfIn PDF document text
    • http://medrea.ru/upload/files/zanisonulomipanazope.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wunejak.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/656088747ddc5ba530e7020afffac357/gofujawujemofolab.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/sj047cg7jm2e42hjh8g8vnmc7g/dikizem.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/418bkr74hhud5viro7g8q54f3l/59635585526.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0d9cc294bfa732e9835867070e571653/bajikametijos.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 17944 bytes
SHA-256: af5edcc10b87a23cdf45687a1935a56ef858b67376fe5baf1f16d705bd896319
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10648 bytes
SHA-256: 076194878fc3944714d8de35ccf95b13f995c1954024265f40e2d2ebc60ec673
font_02_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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