Malicious PDF — malware analysis report

Static analysis result for SHA-256 53197fa3e6e5a1a3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 16:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 296b4eea7d38979032c2c089c0b4c269 SHA-1: 79fd65535406a57b70b50c8b7e7aa0702691fc68 SHA-256: 53197fa3e6e5a1a34fecfd8ced66092b9d8085efa0da35177ddd2802deb61a73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests a phishing or malware distribution attempt, likely leveraging the PDF as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://onlineticketreview.com/images/file/lomuvowufu.pdf In PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/43591761218.pdfIn PDF document text
    • http://neteyes.eu/editor_up/69429538638.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6e806a40745b0b035d047d991a45de79/zewugawerafuwiko.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084244d56660---pakulalokamakumem.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cac729192d0dac868b0fff2f20534f01/memojaribu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5ehf36u8ppbm47eoi1a3h8loe3/lujilugaxirotul.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/tifazejepalonabep.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/54284780211.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abae290a618---90600154632.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3cd84b422eb06f00c532467629345da4/jaxibowurolezexatuxozes.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/05e4341c0dec9a04044a257a1f38a63d/20061129747.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3da5e9593297c60753c9d6f2e931517c/26246897339.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/94507515527.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/37386158136.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210529165038.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108868cb1799---25621835023.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a105805790b---wupuja.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/xoxobigu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/22fdb8355b4f2baf1bcdea62c11ed33f/95249990417.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/98087594183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ergonomia+en+el+dise%C3%B1o+industrial+pdfPDF 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_off0000c22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22C 11128 bytes
SHA-256: 988f30499fb14a89d329c08f6516247332bfb26c3e578d1165038d3cb58ca08b
font_01_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 17696 bytes
SHA-256: b4542c0961c0ec13d793ba45568e51af2f4c208982e656350e9544e4611dd6fe
font_02_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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