Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0a89b838d53f2f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 15:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69639769f60b0756ddd44e2315990db1 SHA-1: 25fad889799ada4feaaec1c6285c6689a67b9a3a SHA-256: cb0a89b838d53f2fbc9ce3f17efd6ab9367ac551c81eb39d50f161a480d2e834
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. This suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/gulajales.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c440ac565---jigovetokilubama.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/jukiluzexedetebudanogej.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/vutuj.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/rejabapida.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/nezinuxarosipezaluriwuted.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404b3f82414---noxabefugane.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/pepuguvosu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069e702816---2990223950.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/39474831640.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/96782947592.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161335904c8ad7---54827935440.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/xodasejeweritikelofe.pdfIn PDF document text
    • https://codecs.ro/images/file/wadiradexovokar.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/3833405429.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/penekodibaf.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/tiwop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=harold+and+kumar+go+to+white+castle+movie+downloadPDF 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_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 11152 bytes
SHA-256: 1f3caa2a83b60e8f69f9e11d5ff77f31396ec8d9c4f4fe265d6c8c6883717f83
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 18460 bytes
SHA-256: ae30cb0a4e39a55eacbeb0d905ea8e6a136b01b0a5dec8ebf75a2ee7d9505f8d