Malicious PDF — malware analysis report

Static analysis result for SHA-256 96586c9b3dc15d3c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 13:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7132434eddc42186de58a6c80773975d SHA-1: 278941625d3a446e707d1dd025c0b6eab095d7bf SHA-256: 96586c9b3dc15d3cfe8e92ccd982ac5c94f4836bf93e35868d171ae54b8a7a3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=filosofia+da+ciencia+alberto+oliva+pdf PDF link annotation
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c163a344d1---21357324010.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086502055397---27270511721.pdfIn PDF document text
    • http://cf-solutions.org/app/webroot/fckeditor/editor/filemanager/connectors/php/imgmedia/kakelilozob.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/d3l2rmilhimu1nrp9l13beh901/53376073371.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/7098279347.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a733119b738---joxawavo.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/zatiz.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/92363952102.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/nokuzuzikarowap.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/jirafupuzovetakiv.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/5198529835.pdfIn PDF document text
    • https://svetozaragro.ru/load/file/73384563472.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/gegepo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/45439449745.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2234ef6f3---44416778140.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/60498016204.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/20632701413.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/zefeloz.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d399f37a---59722925713.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/77238138431.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/83869945993.pdfIn PDF document text
    • http://prmakeup.com/Image/files/37026470189.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b730775635f---77708174646.pdfIn PDF document text
    • 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_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 10796 bytes
SHA-256: 2f63e8b12d42fb4d10421a52a0d188a2411385126651c7e048daf15eac368633
font_02_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 20736 bytes
SHA-256: 84e4cac0da154d8ea4027765c17c3346d8bfefb878bcf59437c7b97fd815ee31

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