Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b431f981d8b817…

MALICIOUS

PDF

144.1 KB Created: 2021-08-08 14:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a092bea3341fe1b58546b557f043757 SHA-1: 8c1d367c62a2e9cf0714207801648492e3912b03 SHA-256: a0b431f981d8b81711614ba5c114d90df504eabb29b198855647ebf70f12e4b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f835daac4---dipakopeberasaga.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b97sflvh5h9vakbbk435vlepn6/jatofamusafogusepileje.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/40960157aeaa6908dc70d454eae59ec8/posimutaluvujaxum.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8b0d5cf78bda4446f3104bd43136703/pivesegixizikej.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720480a9034---7453177473.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b2eef928d246cd167de69c2beaf7db4a/77644833961.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052223484573499.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf522604a6---notitenegabujubixofawom.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8c290309---bexekimenesenukemetufifo.pdfIn PDF document text
    • https://cooperspick.com/files/wamuwukekigofir.pdfIn PDF document text
    • https://orangerun.re/photo/files/gukaf.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/maxatokukuvafofokatinivip.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/wijijiweminorolimebesu.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/nubagezijapokoradi.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/duroluvirimugamakejawi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755c4926613---fibeguf.pdfIn PDF document text
    • http://retailcop.ca/files/89278892618.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/34636193509.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/bujadejakinabogaluromaf.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239717722e---gelog.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/fovudununobenuvogam.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/kijegosetokeguvu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6d2d3d5acdca8e197ffb99ad61d7d9ae/15364049923.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050102275872.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eeda81fef---14026060511.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/76870723890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mod+menu+para+gta+4+xbox+360PDF 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_off0001d176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D176 17812 bytes
SHA-256: f168b648e9fd3b91f92ce7d8558805111963dab7aea639271142b743386296b9
font_01_sfnt_off00020004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2181B 11304 bytes
SHA-256: 867e59aa5f4448cc2dae7a4808b6d7f98895897c72f4ac7ee2e3fef5987cedcd

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