Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9dc1d31f0279f6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 19:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94f8eb3f5c603a0e07f08c2cc9ae95ac SHA-1: 3e961b5116c832571622db49d8a43997b18b8f15 SHA-256: ce9dc1d31f0279f601f5dd878781bc4fcf0690369a1e44de2095a5a3c082dda7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm patterns suggests the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=lord+of+the+flies+pdf+file PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9cb5949b9---tisarujuguviwapugerut.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ba5de1855b069d27a2682c8f5fd9bf86/tonazatigabojuvori.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/14926916212.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/leturugazox.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/dides.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/48678498694.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e77cb13e282f113e46958670434733f0/dofonuwuzitaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917fd15e594---fazefubadokanidadagufone.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cnknq2qfjk9c1oklg3i5uate3a/52573631194.pdfIn PDF document text
    • https://scalper.ir/data/files/file/68923537834.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a3e0920c2129c4c4d2665846d25fa951/44493423619.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a5f43b92---31425947145.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/xilalijibimuvixeban.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2e4e9b4da1834554a6d16f25f0c29e3c/rejunawotiv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb33dd8c3---67066278394.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160863dc078db3---34308869268.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/57286888295.pdfIn PDF document text
    • https://chptravel.ir/data/file/28371731779.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607677ca6b1dd---firafidekinisol.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/nakemovol.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2c6f03acbd23f7d7740e25e72ec12b66/sogirowexoberugufozarop.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/98485624067.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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 10288 bytes
SHA-256: da09dbc351514acc050275a888611e1d6e850fc7c4e3984a5ea8322976a77f3a
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 17040 bytes
SHA-256: 0f27372d0fb19d0448e350f89f61826f754f3c2f16e0ef8d1d8e6603aac121f7
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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