Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce02437a35df7e47…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 14:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94bd88479d889083f82137e2e1daa79f SHA-1: 19573b3d663606baaf37185792f9573b5347a943 SHA-256: ce02437a35df7e4728f6561437303daeb74aad9280faaf2b20a43992f9d25907
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is flagged as a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, although not directly executable without user interaction in this context, indicates a potential for malicious scripting. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=sheet+music+boss+spider+dance PDF link annotation
    • https://www.rapn.ru/ckfinder/userfiles/files/42584710756.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/46259003962.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/97430250011.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/tinesafurosagolu.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210918062729.pdfIn PDF document text
    • http://farmina.ru/uploads/files/wizuzidonasogumojekule.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e8263eef---puledarurawuzudamabux.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/pevebatusapixepawal.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/897f56fecdd1ed648cf85460981eb588/gadelatunakunoxozes.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/64858523598.pdfIn PDF document text
    • http://millecolori.it/images/file/xunajuvepixilobuwidup.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/magetokedoloj.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/4754436413.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/banawifigipimu.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/59755537426.pdfIn PDF document text
    • http://watch62.ru/files/files/movapekevufamedamifi.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/zopukegidogoxepifofazu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161472961e084f---nozotoboj.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904203137.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/21199329684.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/63855046185.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210903133450684.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_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 17156 bytes
SHA-256: cf6f69ca7cf4a86cb9f636fc6f2d74f452892cf12ef30db31fdf06a5d622bc5d
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 11048 bytes
SHA-256: 161003d5619ec0ccb5e82f04194d87b52876803714ed8786380219aaefb79c97