Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bd436f6c121f5b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 23:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3706e13fcd6ac0883c5f30e4c92fa0c3 SHA-1: 56833f3b5e6c8f21961b5211775d349c8ade975f SHA-256: 93bd436f6c121f5b5265a8a68eb68ca4910408e224ba8c235fe38f5e602a3ce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are hosted on disposable infrastructure or compromised CMS uploads. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ykzn8.com/upfiles/editor/files/52806505834.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495e10e56b6---15528282729.pdfIn PDF document text
    • http://kdekdyjak.cz/data/30403856182.pdfIn PDF document text
    • http://vpsystem.com/files/fck/27910924687.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39c18c77c---taroj.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/26667092145.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/7950340199.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/sejoxotifedakineloxi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161351c82c45f5---senukuzorikipofomi.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/robovurefalanedonof.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/13057529813.pdfIn PDF document text
    • http://tercovci.cz/files/file/rureke.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/xopuropumage.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/17338765601.pdfIn PDF document text
    • https://eurotig.ro/file/23461348049.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/kawibi.pdfIn PDF document text
    • https://coil.hk/upload/files/julolarufujat.pdfIn PDF document text
    • http://freeorden.com/media/file/63459317201.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/969c8d5fa73912a3e7ec451a756e30e1/70878263546.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/68139430169.pdfIn PDF document text
    • http://rsst77.ru/upload/files/55209530847.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/20356968745.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hsbddcbqpalqavs1b0ii5p1bap/ronedaxunodosap.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/mibilur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vault+software+for+androidPDF 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_off0000b3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D6 10504 bytes
SHA-256: 91c5b6a5653771750bc1a54a5a6a7de6b60744fc55ca7fac5513459d391da8a4
font_01_sfnt_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 16084 bytes
SHA-256: b57c7cf28897d341788779c7f6946d02033e48c7ce94b1b7d80ff6fb8bc57722
font_02_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.