Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbec3b069622fc2…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 08:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 83864fe24f95cfeba64a234a1ce21f4c SHA-1: 2ded6ccfd7ec989ad20d6c814b9037c18708a4be SHA-256: 4fbec3b069622fc22b40d31fe4f237cddc0cff1bea6d427971f546ff9dbc79b2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites. These sites host PDF files, suggesting a multi-stage attack or a sophisticated phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bf1c2c0fe7822e50eafa8ab47f3faa91/gataluduwugudojunukujixax.pdf In PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/46ecde2d1ef87bae0eac02c3ae69ce13/83284008175.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160db929bb0993---fobidexomazevosotadaj.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1bfe0ca5---44779498072.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60ab827c8a---nefiluwip.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f830feb774---16687002389.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5c45f745c267bd85b4f691f163a7d90a/nenovogiwabosulapoporuza.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae678b76b54---16516052476.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8477c7cc---sutaxitaxufumuwosuwi.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/29163411425.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/4942599896.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bae51c176bb---xupunopi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e62d0996c---9027341990.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f674eb2fc---36539075792.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/rifadiwegujuvepib.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d5a57e4c0df60539d95844aeb64e8a7d/notuzefubivaniluw.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/1303983948.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78324434731.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c02fc65cd1e---99147294353.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4c41cddfcf85c45eaaae7eea53e67cf0/6940291313.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/65887978360.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/77232811162.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/dolabadidijezelove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+was+madison%27s+argument+in+marbury+v+madisonPDF 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_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 11180 bytes
SHA-256: 5b28622952583b748df7311094a2f3a2409213a376fc40323340812bf8c4c95a
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 16824 bytes
SHA-256: 200404b9b6b936d3cd6d6dfa71c8d7d43d87bf94597586c2402a5c98891cec6a
font_02_sfnt_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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