Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4c931843e339fa…

MALICIOUS

PDF

203.8 KB Created: 2021-07-03 11:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 78a8949e05c706b6ada4e72a3166a6eb SHA-1: 2beeee390e5c07de48f9721d9ab0cef3ea7bf372 SHA-256: 7d4c931843e339fa54e957e18b3056b73a769e6f207f7a94c366d66258bb2197
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or credential harvesting attempt. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=the+story+of+integration+of+indian+states+pdf PDF link annotation
    • http://surmounttravel.com/userfiles/files/lupebililez.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95a07f1e5---xefesad.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/jewizugejujonidinomakepo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/77300145775.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/fajigetijudulibutem.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5c3b79fd---50593158836.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acdc72571---rulafewuronusuzabef.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d897d5e7---ziridapoxuli.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/156531ae7731abeca087974f844d591f/16389376513.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f247fedd8555b6f041cf7dfe0647d7b2/tovudojajozegeto.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/48800984714.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/37409969668.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/tuwadora.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/28291471610.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3a3bd8f460c75f049a5c04e8eabe4ffa/zugoridaborajatareleti.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kjgb9arejla6ag09gcf6d8o9hp/vizovetewinavenosopofava.pdfIn PDF document text
    • http://tw-go.org/files/nagemumopov.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071699cb7eb4---31748405587.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/af4a53c3c0edd4ac81fa76759a47b053/jodizeduto.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/mesunoragigivi.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/fudokoveronenu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ffbef4200ccb6cdaa3f455cf2f42b4c1/negag.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/91938139789.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/67255241005.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_off0002bd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BD1C 20088 bytes
SHA-256: 322d938adf167490b9bf0f04c36dfbb651fd4ce916683dd8c33e8dc6ad7c1011
font_01_sfnt_off0002f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000308b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308B6 10808 bytes
SHA-256: 11b33420003aa537ab228601419a6fd1ac8062a12365ee45ae53582f1bc8d8a4