Malicious PDF — malware analysis report

Static analysis result for SHA-256 504c6ce1efd16d55…

MALICIOUS

PDF

89.5 KB Created: 2021-08-09 04:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 677a4ecb7e8729945268997684834240 SHA-1: 0e91a00b7b2cd9a3274067be3030d5e049fe24b5 SHA-256: 504c6ce1efd16d55fe6f8cb5d41e54c4cb00d0be6e4ba424fe57b947949faa51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic. The document body is heavily obfuscated and unreadable, but the heuristics strongly suggest a malicious purpose, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=palabras+para+brindis+de+15+a%C3%B1os+del+padrino PDF link annotation
    • https://damiel.eu/userfiles/file/guvovurer.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/b9f1a69b7f76dee12e314ec0407f023a/39940883070.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097374e1c2f4---sekusokegemidadazid.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/diditalegiwita.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/42699067499.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160716ac874106---28913215030.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/54787525160.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/48f9fe8a8116cfbe427546fa05024aac/zavirubulinibo.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/mujisutagogakelurezuket.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/jipimotupanufibavedes.pdfIn PDF document text
    • http://df-2.de/images/daten/file/95335867486.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gaxim.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d883efdb4ee---55746364021.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/57070702161.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/de80ff2bff5af3fdae7ff56e478a8ae0/josixovotuni.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/41651178223.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210627091031.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/77575142137.pdfIn PDF document text
    • http://afslab.asia/upload/files/53720499897.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/74930246844.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094685738c5f---90370345798.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/xorevavabi.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_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 18856 bytes
SHA-256: 8293796a2a006955bb4737e1f3bad0f040f93a8082f3ec1db0e5568926069ca9
font_01_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 10820 bytes
SHA-256: 269cc7191b1e73bc5f03e4b4818432570d1432cb5cbc6e0b94bcb9d35d804683

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