Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc72d403fa87da68…

MALICIOUS

PDF

86.0 KB Created: 2021-08-08 21:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2bf3bf9b2437fdb57cd72f98caa2086 SHA-1: e93b9fa9e6fcca58cfb0f3a23321f339048419fa SHA-256: bc72d403fa87da68ea44833916303a722d5e3ffb019eb2974231fe6123769cc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://jxloanchien.com/style/postimage/file/liwesavumekokebor.pdf In PDF document text
    • http://timeyear-v.com/userfiles/file/31842128770.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949bf68397e---17205405217.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zigidajomeroxiretame.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/pijavevovuzakuvexew.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/refezajuguk.pdfIn PDF document text
    • http://centromp.it/userfiles/files/bovaxemefoxodumu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7c710b3fde1360682ee31bb3a90c9334/38168979765.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/r6cjd4v2335prkkm7k1t413rbk/8844346890.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/bawobi.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/28535773340.pdfIn PDF document text
    • http://pinxedien.net/upload/files/87090971670.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/wepotobo.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/13276389003.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/90166524951.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/49105660975.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/71141963927.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074abf990ac0---lixomunamaledozu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05acd55c9---manogomakaxexe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a4c96855---73525756553.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcjadu68pqfas84prcesdqoklp/fefixuzexe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22979591a---91717131999.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080de31041aa---najigamuvex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+edicion+platino+descargar+para+androidPDF 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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 19936 bytes
SHA-256: 3fc7f68f5e14c59e70be19f03f606968d33865dbde97692996dd8e2273f9f4c6
font_01_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 10952 bytes
SHA-256: be31da15fa7f80de1d6e3cf4eef922ead8c4ae83f0064ee32e89b834a41b9925
font_02_sfnt_off00013200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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