Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df9dd5f8e6c6712…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 05:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7fb1862c4e08dde87fc6a3bee5b5b3a SHA-1: 5e7252e98940b8739b6fe57c7a29a95cf2de7921 SHA-256: 8df9dd5f8e6c67124686c535fe2f494b06194a44f1cf316c30339bcfc507388f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=pragmatic+play+casino PDF link annotation
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/nexod.pdfIn PDF document text
    • http://iphysiology.ru/upload/zuxemenebufugexeke.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/503bdfb58ce0a06a2af49d62e8da13fc/dasivot.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/jurepupilajuviraropun.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/banumirogo.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/48019968985.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/saziven.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/jetojuxinobakixigixi.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/41165667903.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614000b5b295f---52132489349.pdfIn PDF document text
    • http://baove24h.info/upload/files/2917325112.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pm1uleoie0luolbig2tmfbqku0/devizeredewigubopajepofi.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60167835625.pdfIn PDF document text
    • https://cet.sk/res/file/pifabosesolinodi.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/vevavazupumizowod.pdfIn PDF document text
    • https://12shio1.com/contents/files/xokebisagutazumezonav.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/19143986934.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/xekararegelepipadisani.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/53c57b00f58a698f5d938ed26a87eead/80779138.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/63314343169.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/61953625077.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/jexiwojilugojegipowujen.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352267b76da---27513223423.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/pipifosok.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_off0000bc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 17752 bytes
SHA-256: 2a63519ed2eb421d55145179e1b43a95fb222a16a84ae3e76faaf06f4023538d
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10700 bytes
SHA-256: bf326977320712de951aae2f5a0f5247df996c4ba3ba67bb68155573b861f45d