Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf4eb579e08210f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 12:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 486de6d659d5f6d0e35c2a2522c0bfe0 SHA-1: a9231f5c0332068a34a2b59653c44e4f46cd52f9 SHA-256: 5cf4eb579e08210f6cd1178d38f66486c0ef52660f693a6fa1dcaf2ca52a9271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial access via spearphishing.

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/agn737qrsk3di9e05uv83sic81/disisisapotida.pdf In PDF document text
    • http://formel1vermietung.de/userfiles/file/34636193509.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/faribanibel.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/xorasosevetawujefalamel.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc8c9899a9---tadodomo.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160afcddab4963---rarojunagezafe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/42bcad5d211648535fa2a714abfb730e/73704726825.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e85360d2b---movugenawimijowexuzug.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1166560a2a---48367145955.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/gawegikemitinadulodumet.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae2b179c2---jalasenetukubarijosewilik.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/56140871640.pdfIn PDF document text
    • http://kasargod.net/uploads/file/vatawubasik.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe93f8ce2f---93489997118.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ce8877d6---fizupiperu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ede69416f---30309713635.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/91092252534.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/jibirujapoxixizipolajama.pdfIn PDF document text
    • http://lamay.de/userfiles/file/vigubane.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161059a983cada---zavufomatedal.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/bilonewenomogenus.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/fifejejuta.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/49482710444.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/midibevokepaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=alphabet+russe+manuscrit+pdfPDF link annotation
    • 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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 22876 bytes
SHA-256: 4da50827539227038e79775fdb658c2d62e451baeae3e1cdcbea5453b191a027
font_02_sfnt_off000140a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A8 10984 bytes
SHA-256: 4afedb6f316a9de419b08d3d26078b285f42a0e119e0b33d4049edb19a405f4b

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