Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24e248ac09c1231…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 09:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 414608fc7fb25c6a2f2714c70a788af9 SHA-1: 2f55436cd33966670ae0f5bd8150fa4a3cdcc686 SHA-256: a24e248ac09c12318513f72ccd77950c88daf3827349362fc7610c82fa6e6e2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a strong focus on link farming and leveraging compromised infrastructure. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings confirm the malicious nature of the file, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=justice+league+full+movie+in+telugu PDF link annotation
    • http://suspensionestg.mx/userfiles/file/rudunanenejamun.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/61590539718.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f71d4c17---157827346.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/21199329684.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/85033703539.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/gejusenajujalevedu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141150265a58---vefosotesemepumabapolijaw.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/kipizogafekisov.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/63622188791.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/xevug.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/sakonomabodasezudu.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/pinumodagoderaxozeniz.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/xatetaxabesesabeb.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/70043610651.pdfIn PDF document text
    • http://platcometals.com/images/file/99738841294.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/pugonawinojeputisebigur.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/13067509106.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/gekus.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/tagodubori.pdfIn PDF document text
    • http://cascad-trans.ru/files/12441448796.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/30018662660.pdfIn PDF document text
    • https://brakos.it/file/moborujuzetipunili.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/96031059756.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2c82c078ea41166ca4260499cc33dfe1/tajimakat.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/39110745116.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_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 17812 bytes
SHA-256: 62bae5e0c99d7a5cd1b2afe523792d6f5eaeefad6f925b829b01058a7c74d915
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 10736 bytes
SHA-256: 65406881df164c1e2f4a24b8b17b97b27bab07591ef495151962120fe6717eef

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