Malicious PDF — malware analysis report

Static analysis result for SHA-256 6765e30251618893…

MALICIOUS

PDF

93.7 KB Created: 2021-07-24 12:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71986340ed3a619469c73ef7b3cb2be4 SHA-1: fc7ae7b5805b011b0531d282851a2464a178298a SHA-256: 6765e30251618893cad78bd7cad541f19954022b2cbfc55cac88968eb23a08bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites using the Formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised infrastructure suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608896f1cc546---wijawilolafidetigad.pdf In PDF document text
    • http://vipforiraq.com/userfiles/files/64793010076.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/zanogigejukugososowuvuro.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/58133639694.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/zazerirowovozubivew.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16073aa9025604---9921789376.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c094da8a193---67844214320.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cc1dddfd78---17221554434.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4fdccc94c---649891728.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/68424341812.pdfIn PDF document text
    • https://congchung7.com/upload/file/76741720296.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83b816cc2---13277097133.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9f82e5741---sijibesonujifuvixogikukoz.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c00b744fee7---59958343907.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082fac33b079---lanozalurut.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8309822a1b---dujogodutudawudul.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/t3raf1gmddabn0knb24kfijl95/63363427193.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/17244763280.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747639ddb2f---fosugo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/sf2sqb3mpp9645r5qhltumqr82/fivobogazomezufilaxifug.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d7011c4c---wojosupatafixuviwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=como+fazer+glac%C3%AA+m%C3%A1rmorePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 19424 bytes
SHA-256: 40ffcc0defc924c4db1edda084dc0869b1c573311cc43b63fd7140c0629ea45c
font_03_sfnt_off00014e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E05 10648 bytes
SHA-256: 61e94b43f777621853eb341c03bfd0b1fb55a32860c61947d1713e1c5fbf1a9b

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