Malicious PDF — malware analysis report

Static analysis result for SHA-256 137d294cf18e8d8e…

MALICIOUS

PDF

126.9 KB Created: 2021-08-07 12:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f67da700a2695736721890af6eb4cf8f SHA-1: 468ccb77b92e3fa3d3d36deef4b8e9bdaebe99f0 SHA-256: 137d294cf18e8d8e41b1e9d0c6795f26b0ab935620fa7ec64bad924200130638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the presence of external URIs further support its role as a lure for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://www.tamilsaga.com/ckfinder/userfiles/files/tusutubisove.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fceaa1e2f5a---dozibipezarudosopi.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788aad63cc4---16885397236.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00aa3f56b---73125876934.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/4ecffd55c2310bf0ca5597940eff4a2f/zadomazaga.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986da0473f2---roduxif.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4s951lj7dc5crtsigro22uritm/pilexoxev.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a075b90d11ed68011499f6ce6536d443/wowigolaraf.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a3993c9d---jodupifumojovajoma.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076881faaf54---63075883754.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/11597617190.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/63910909167.pdfIn PDF document text
    • https://unosms.us/userfiles/file/19196557339.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/2498627750.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/xerigajenurorexewi.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/19714636259.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/mefajeselolujipebevuraw.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085d82861f22---zukoxit.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/kuzaz.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160737bff815d7---gorowowonijasedomifu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00dd666a9---lujatefefogitojis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=who+are+the+characters+in+the+story+les+miserables+brainlyPDF 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_off00018922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A134 20612 bytes
SHA-256: 8e6b908f6a43f310a73356604379462e2ddbe86f6ecd28fc9355a609a3da832f
font_02_sfnt_off0001d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4DF 10740 bytes
SHA-256: 7383e06773069b12f35d6ded531139522815592262355b38237fe6e0a6334087

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