Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bd609fa12afeb5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 13:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a596833c3c19bdd7bf8a9e0c3e2889f5 SHA-1: 5f239cfb900a0255dd7a39946b76e586fb138b2f SHA-256: 19bd609fa12afeb550f6df4d342dfeac02e35938961381fb85d2690755d2083d
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, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gazdalkodjokosan.hu/img/userfiles/file/mufiruj.pdf In PDF document text
    • http://sakem.org/userfiles/files/73437833256.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/72915607079.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/1926158492.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a03b63f8e---97648452565.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/32733482423.pdfIn PDF document text
    • http://kag.fr/userfiles/file/73363251448.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u0nko0bso281867lhq0fphe7te/57917169603.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7c9c99d0---pefosakibagol.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/wemijuwanosijinufapi.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/84473039610.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/48759986184.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdefa4e8a9a---lakujolafaziwebokija.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/fubik.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3e257d05880813bb0950009f6e5f2afc/22033178754.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842d2ee4ec6---bujamafasaniwumebabiden.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/zanazuraxineso.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/4904130023.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/kusige.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/68035550919.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/79736613140.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0baa6a3a---20399973121.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/kuwibuxu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a08034d3e25---64008836513.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/zolapaber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chris+brown+suite+life+episodePDF 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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 10792 bytes
SHA-256: be653ac93c53746c2b90d3f629bb15f73ded8a60ff50cf76d2b734b93857d841
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 17748 bytes
SHA-256: b7687384b046a1b9673bca2f70eb03d2b91027c0e62da058f5c3e891754b0bd8
font_02_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1