Malicious PDF — malware analysis report

Static analysis result for SHA-256 894d979a2aaa303a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 09:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52b46291accf49ffda680c8caa6bc27e SHA-1: 4dfe8f38e2dee870893fee73db21655f4e0991d0 SHA-256: 894d979a2aaa303acdbe333100c873fd8c3bc4335ec149c8a56b194e8909d737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics suggests an attempt to obscure the final destination or to leverage SEO for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=tuguegarao+postal+code PDF link annotation
    • https://clicksnepal.grnca.org/img/files/files/kigefagomepuxanazoxinov.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161376a255c508---pakilivolotopigef.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/71433792112.pdfIn PDF document text
    • http://castel.lu/userfiles/files/15023440129.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/marejegopili.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/77714481971.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/68269869882.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1f89ff41---15758469162.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/wekovepezam.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/rupanapobuwubumopufesaxam.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902111345644.pdfIn PDF document text
    • https://stormester.no/files/file/saloberufekajozafovejuka.pdfIn PDF document text
    • http://vswet.ru/f/60272054599.pdfIn PDF document text
    • http://happy-land.hu/editor_up/rofijezo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2b53abeb0500ca499aa3fea9c7a372d/61715513093.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/pepebi.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/6475889696.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/savim.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zivefenijexivixonuk.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161366f2500a3a---jewesofoletol.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/95710966302.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/62163233174.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909015634902085.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/72446000972.pdfIn PDF document text
    • http://machulski.com/public/file/lukugufubatupunenunikir.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/vusutemodaxapu.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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 10556 bytes
SHA-256: 7ea7c76905e2a41cb73f214e5f7b6d10c301e525fe8da594d86f8a2a05f6cabf
font_01_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 17516 bytes
SHA-256: fb5d4028dd4eeb122fa8bdaa460bb723f5632be59d4bb3d68c477286e7f73052
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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