Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd3237bf89375cc…

MALICIOUS

PDF

78.4 KB Created: 2021-06-29 10:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 24beaf8179a6efac1290c5c60d4162b8 SHA-1: 1ee08befe21b34ada68250a460e0c566aac4345b SHA-256: dcd3237bf89375cc093703a663d47f1bba4d434a8cd256f8901461e1be3d78b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm, likely intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5c7l8vdrmglltqj5dlpqkmr7t4/16337569587.pdf In PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/5261713481.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea3203270---44439227861.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a307f662ef9---milifukal.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/16649680910.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f65mjk4su68vfjh2jt5d9tdk24/kukekebuwewipe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b417570e7b6---pasal.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077369166ccc---jajigisoxuni.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6bde7sp177ok6idducli140kq6/gosini.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e48c4be31---75348015730.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc01556bb9---55696308405.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/kefuperebimunikosizuwis.pdfIn PDF document text
    • http://teraval.cz/res/file/mirufogofefapuponakil.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jawivanewimuf.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df4d8a64f0---bizuzuzakibipuda.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4301315a---jisesawagidoguzosop.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/07e05ccffcb409bc257492c040985e43/61160913289.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dg8uodp8e2uo143iu8nj6tkgpn/suribaxonarun.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/86833b1da7fb5cdddcc3844e33ce0edb/35474010734.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/7050735d66b1d26cdff7f626a3e2eed5/ridemutinu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6d765037ad6c9f59a5ba9b0156c76b79/91450841252.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/xidanujuralafokiped.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/90348474782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=why+oil+and+water+does+not+mixPDF 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_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 16432 bytes
SHA-256: 126f0e5fa375dd43d9ca1f725358dd11ca07f9499d5db7c903767fed86c62026
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10808 bytes
SHA-256: 8ab39ad6af1cde055ce022b579654f3cdd59ec72d5b336b24d76bd08b519d1ce
font_02_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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