Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f77be77c4bbf2e…

MALICIOUS

PDF

84.6 KB Created: 2021-05-27 12:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a96c513ff38e83a4331c150a21a9920f SHA-1: 69a49a031875f4558aefbae6656ab591b32195d4 SHA-256: c0f77be77c4bbf2efec402f72dbfbd6c6159b3646795921c81eb2fe0dcc7c2c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/uplcv?utm_term=cuento+el+monstruo+de+colores+para+leer+pdf+gratis PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4098103c---45864425378.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/wakibimizir.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/92009388a6c98ae95202b4fcccf60779/ravilejofosixonugoto.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/fukazerozuzuridumikaw.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/13269732524.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7365d41d---timosikinafirotufibokesu.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7g6o9ag6jo1f4i9fohr722q1a6/jovopopedigilisu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7d81e0bd3a477ed8990e1247e195f170/muvuxaweweneniwa.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p58jeji4rkdth953huhj8798d1/67270548765.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/51coaefafb33ectsh73rtie520/lodiraxiniwab.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b5427b3e---90918574283.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/885ec3d48a12f7f491f9471731d10a85/5341013722.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/gtpko21jgu4udl5ifjcmmbh3lj/godejodok.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/738a44cc2586f177a4de40461a5521c3/muputowikaz.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xisenojebiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 5380 bytes
SHA-256: 771198d10e2e0d9e88432d3aaf62b28c81976b524682687b3e68cc39c51d1e24
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 11520 bytes
SHA-256: 336aa6141211b5f536ea62ded26cf5cc2dd7657f62665a0f5c80ee2788625385
font_02_sfnt_off000136e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3