Malicious PDF — malware analysis report

Static analysis result for SHA-256 f976fcc62f4a910b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 17:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37115f4695a3f3d502a07eb18680afb1 SHA-1: d57bf4961c9242173ad5dd6a574baa26ebd2df11 SHA-256: f976fcc62f4a910b91a86dde12a21f4a198389c979bcc69c7f38892e7eae62c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting it is used to distribute malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://danielstrehlau.com/userfiles/file/73128229740.pdf In PDF document text
    • http://studiorapizza.it/userfiles/files/45681349221.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebabc4a37b---zowatozaxa.pdfIn PDF document text
    • https://bataretak.com/img/files/file/91748204017.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qt3tos276tgdrrjvuoaqgl8g40/78153554045.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/bazukaxil.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b643ac96---72286563164.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/5018134014.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3ccdcbd82851fce3288dab99b4eaef8b/17211168845.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/25312854189.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/wozafu.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/25842647387.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083faaad1d9e---88818435842.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/jevokaranutojekamotus.pdfIn PDF document text
    • https://andrejc.si/files/file/38606428460.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/buputukuxusodatosope.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/ririvinobokukavapefa.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/54394647729.pdfIn PDF document text
    • https://clove7.com/userfiles/file/sudobawilenuzaful.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612e433eb3c4a---bopab.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161071c1f94c9c---21517764517.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/kevujisite.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/50349048781.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/876eucgk6e8k9f4r3vskbdbs24/62697836537.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/89758762306.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/7966018284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=livre+tout+sur+nous+pdfPDF 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_off0000cec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 18632 bytes
SHA-256: 1bf2d2e91df16b9ac86ddb9b6746dab6a5911fbd151212b1e90d19a6e37abc22
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 10404 bytes
SHA-256: 2142beaa5886b26e4ce009759b69a7f93ad41a7ea2f0cbaa32fa0b69928aa15e

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