Malicious PDF — malware analysis report

Static analysis result for SHA-256 d746cf2f5da457a6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 17:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81422685a205a10d163c968b23ec1399 SHA-1: cc4c0a67d464ea94726479c6bbba9947928ebcb5 SHA-256: d746cf2f5da457a6654a63aed5273281721757c9f6e21b3af06a2b72ea566aa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=hada+bhoda+pdf PDF link annotation
    • https://novitas.ro/files/biwuvagubevimivuvatebaz.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/muzaseza.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/sevamowoludikoxarubikofuw.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/sunedexedugokit.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/virikimijefurelafikos.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/62094800769.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/14389032917.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/69165426078.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/20584347412.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/7149b516642bc421bd031d4ad34e5744/lepirupiwopep.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/96477420534.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/misadexedavamozojexusox.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tmcti45tu9hejogcpcf47hg5p8/gufupafexijekusiwirewobob.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/99775826005.pdfIn PDF document text
    • http://enkepharma.com/upload/files/todiw.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/86845582327.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/tokexurunituvawawuxobes.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ff97c699---16052416885.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/lufefa.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/rixepajokovepubajokiwafan.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/84153876503.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/14565102206.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dbc04ff3aab23fa12da34b5521705839/30388981588.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/40963740894.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/73927111400.pdfIn PDF document text
    • https://sainaudit.mn/File/lotana.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/34048102762.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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 16984 bytes
SHA-256: a462348a7be63e6513f6519f53ef186d98404efcd567c8e03ac84a953b216ee3
font_01_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 9988 bytes
SHA-256: 5c23a8a6dc2954895f150fe99b0b257226dd0e1df7a3bd8c67fc58220be49f5f
font_02_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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