Malicious PDF — malware analysis report

Static analysis result for SHA-256 4896df3fb9a2b5a6…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 12:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c6e04d4097639065c615d546f2a95b18 SHA-1: fa1fc089f646e31e9257e3a92db79126a0787622 SHA-256: 4896df3fb9a2b5a636481d5419777c72463f1e322eee9ca93a9a1fc654e11bfc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=qasidah+muhammadiyah+pdf PDF link annotation
    • https://icon-studios.com/userfiles/file/kujubaferavamof.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/gikefi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/50847692982.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1610e45fd749b9---gimaripujemamuze.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8f8bcbf0---jejilaganaretunagevak.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/44844a4a4dfd499860a344fed4a9a32a/suvipuzilesesepo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acde064350a---parubigusogotefutene.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/42522329482.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210830041059.pdfIn PDF document text
    • http://billsky.ee/files/file/maduma.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d197c515be---budusutefarerilapuro.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6768d66d1a---mewusukufurufoxuvomapufom.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/tesulafurifelid.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/jonidulipizebojebado.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210823225828.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b86a94e9c4---12208445614.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/68760768712.pdfIn PDF document text
    • http://szwygs.com/upload/pemijitedegazalutepunegeg.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/mixasotorikizuga.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e0acaf8a---56944473351.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/sulosefagipom.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4d4dc3dc---laduxapowikip.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/90158777881.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/fotenuwumu.pdfIn PDF document text
    • https://agermag.ro/mm/file/15892435874.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_off0000bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 17428 bytes
SHA-256: 8219fce08fe3b19f3eacce44af75b16f302f22d8fc872ea36bb967580334292e
font_01_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 10436 bytes
SHA-256: d9736708b97eca0e8e9d40b11c701101036845f0f1a4c2ab1e528dd0fbc44da3
font_02_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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