Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70a0d23d3dd63d0…

MALICIOUS

PDF

76.2 KB Created: 2021-10-16 11:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c8f248ae4cce1ae99be9e595cc12a5d3 SHA-1: 8e87a2aacfd93e227b81800e414b7aa228734349 SHA-256: c70a0d23d3dd63d006fa13247788dd9cd374dd30ead93daf4bb32078e0e812bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were directly extracted, the presence of numerous links and the nature of the heuristics suggest an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dodatkireklamowe.pl/web/uploads/files/feboru.pdf In PDF document text
    • http://pokewaveanaheim.com/uploads/files/57223084560.pdfIn PDF document text
    • https://actorconseil.com/files/file/jawovidapik.pdfIn PDF document text
    • https://ismart99.net/upload/files/6275263505.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/pabetawutokujuzon.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/43255986142.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/95762566378.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367aa23a47a---fovesudexul.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/12721509387.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/dawawewibajuriluxed.pdfIn PDF document text
    • http://eksternest.be/images/file/20109954511.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/kewupofutinojerat.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/mugeduxebelefafevujo.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/39581886142.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/38bfhrh87fs9i2qenkv69i0qpf/81219407644.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16168b6a2258af---21925012444.pdfIn PDF document text
    • https://advik.net/userfiles/file/kaxepafetiduvosogu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d4f05d92c308acc5105ae1f62c0922a7/80352965.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/moxiximuzewidofe.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/44707121683.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202110011212439378.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16153d3a966e9d---muvefov.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/77103916518.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/98005595588.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=illustrated+everyday+idioms+with+stories+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_off0000c2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 17560 bytes
SHA-256: a4ffee649dbedd510e67c198961e44a7ed67abfbba4ca4e9d99b579c3c13df1b
font_02_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 10976 bytes
SHA-256: d13e16cb31e8d5f240aaf7b35de08e9859ae1fa986385b89d076f9c93ffdbf90