Malicious PDF — malware analysis report

Static analysis result for SHA-256 5284385b8c4090bd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 08:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0f2102aedb00d819b2a688dafc4f22f SHA-1: b0902d52e361d28737ca932e526f7af7ad93cead SHA-256: 5284385b8c4090bd2a825f09f38d5de0aa2e9d5836468f447749c29cbb98f9dc
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier with high confidence. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://plentis.eu/ckfinder/userfiles/files/13792318053.pdf In PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4c450102eafb7d955e15f5bad9020156/xozunimonologojoberutuk.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072badb9ca30---24961967145.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa//files/8251995777.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4620610b---83838635402.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/80955908971.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/97895108417.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/ligolupusewerafavam.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/87f88ad4ced4e4b6aae168f8ee6233b2/tusoju.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/74546041219.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/47857988618.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/vujozipe.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/pibebumububekuledunulodem.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d643f0574---damufularukizulefifa.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/fajilelojoravoru.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/92749436600.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bc6a27b54620424723471dac5fe64a57/3241862171.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0b63d46c3e986e4fc8208fe714e33951/14917244132.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/63981081678.pdfIn PDF document text
    • https://papiratisk.cz/soubory/fizutovoziwatiwevijaka.pdfIn PDF document text
    • http://altinay-law.com/images/file/65542761668.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/bagimadibado.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/10886333955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=use+of+may+and+mightPDF 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_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 18332 bytes
SHA-256: 5cf41f4444487159ca8f113470cc43d9d2c05efe94077d58c7beb25b66396656
font_01_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 10776 bytes
SHA-256: c6302912948dce01a23aaeb2f1ddb973686451391004ad39500d939394360165

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