Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c10bc07329ba90…

MALICIOUS

PDF

85.6 KB Created: 2021-08-28 14:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ca9a10d4d9eadf49882b7303ea4a4da SHA-1: 6f196faf552b30db69251616d942fa019901c6b7 SHA-256: e8c10bc07329ba90d726ca8d577ff31f0bf5038744df68e9d05fa1cc80b35f5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the embedded URLs point to potentially malicious content, and the document structure suggests it's designed to redirect users to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75f59aae60---70544564216.pdf In PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/kobd8f6srr4vnq0g40ikjghjlr/90626863206.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092960cd40b1---nisir.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/lalunafapagoriniruwi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df4a8e8f8---nukibepez.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/41067411280.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/rivizapivalobit.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c581be32fab---zinitaj.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/73286241060.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/834e824524a57307a2e9f563b43fa713/51780802371.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a82672a44---37659751331.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/49224089364.pdfIn PDF document text
    • https://steammining.com/userfiles/file/buxawuvaxagamoz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4df0a1aad---wosoji.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a6e25ef98---74500616075.pdfIn PDF document text
    • https://shidoremicrosys.com/media/86217688938.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/21522030155.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/51181135a02e04206cae710f95bbd561/jizupipepoxupejelo.pdfIn PDF document text
    • https://ecoretras.com/file/pimulegixa.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nakuvotenut.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0131e2ad37---kotefasosogobaxi.pdfIn PDF document text
    • http://safarang.com/basefile/files/11586258694.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/97191488147.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zuvukudani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=using+an+aerator+on+your+lawnPDF 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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16964 bytes
SHA-256: 81bc5ef202c395c5564f4b9b6930414c3d8d628843b83415898cbf31ef1c20c2
font_01_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 10592 bytes
SHA-256: f218fe88f321b7bcb12de3bc31079c6b956deaacebd08635be4cdb7788d3fc9c
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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