Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bf03aad900f4f7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 12:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0489eceb6c069ce898d13ba091a94b3f SHA-1: cd4547f5242c18b804558181760c9449ebfb0405 SHA-256: 99bf03aad900f4f7e8615383492581fd8ff24f16cc513631de2258210c5a1b01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to obscure malicious destinations. The embedded JavaScript is a common technique for executing malicious code or redirecting users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://charterboatdeliverance.com/uploads/files/91948525823.pdf In PDF document text
    • http://chothuethietbi.info/img/files/maberibezemorupeviwuzex.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613361bb2c0d5---91061665563.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/78a3f0ed23d19012ba1f4241dd6b00bc/posonu.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/ralugonadurupekevepuvizeg.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/71016615460.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/34203107374.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c718c0ebd16f81ba89ac8a0fb3d17cdd/57829465388.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136faebba12f---28208993656.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/fibudodagiz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f64510c0a3---28284038699.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/77333308842.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/gigop.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/wikedagagosoripamevi.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/pesamunejidifa.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/gexoramufemabixa.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/guwojojeguniwipezoxuko.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/19823589582.pdfIn PDF document text
    • http://ilkemymm.com/image/files/75902145999.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161376b5639ce3---lasusavuropivageseza.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/80098487627.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/xumezudazamiji.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/mipojavi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a208a36f---pabatutixizezowori.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/retejenuguxibemewugedemet.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/13453581639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=last+day+on+earth+cheat+appPDF 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_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 17216 bytes
SHA-256: 2588962f2559b2c2503700a590b002c07ac8e0fc6aa44f0cbc24caa289ceae69
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 10544 bytes
SHA-256: 5cae8601df44e0928f1b5d43e68f2638ca908baca672675a0070af688d0f4243
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1