Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c23d828892d4c4e…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 01:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c73e9bc7a9adbe0701d3450f47f7af6 SHA-1: d774eef51d707d2f958309990383839b53141ad0 SHA-256: 7c23d828892d4c4ea1e67c1e1f891930cb8fe354b8a2596156ed832f8c60a7ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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 https://raovat72.vn/uploads/news_file/32767207971.pdf In PDF document text
    • http://tourister.kr/userfiles/file/roresavusomojakav.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/51754535194.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///8647069866.pdfIn PDF document text
    • http://fibaquitaine.fr/cebatrama/userfiles/files/1421110369.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/mipewixugeruduj.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bae3763440b---melunixosudulimomipat.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f06eff118e---17949624875.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062445851_478887758.pdfIn PDF document text
    • http://climtech.com/files/files/kojalosab.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/silikajabitedipinumak.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/51892348904.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161202896871c3---pevipevudanoki.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0cc874b9ef50e8436070ef1a38df48ab/satosowagox.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/pasadobakumure.pdfIn PDF document text
    • http://rideco.hu/upload/file/dorudasufalapatep.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16127084e5b0d4---wubukitefawurej.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/uadku3n2kin4r7pbih793ise57/tavotib.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/98328761220.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/270bb8897d66d2cf7970d42f671bc52b/98085530776.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/saxezuvuxelopuwuja.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nupokuruxukenux.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e4ab577b6e934e04418beaefa2356068/nixejizabup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=smelling+the+flowersPDF 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_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 10660 bytes
SHA-256: 84061cbe6bfd752bd7bd805ea61aeffea626bd45fdab902db9224f26eb346152
font_01_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 16676 bytes
SHA-256: f87ab670860dc6627e8fa0e8aee64ab08111cde230614b0c17e09f9dc8ca3c31
font_02_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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