Malicious PDF — malware analysis report

Static analysis result for SHA-256 1633169b3e914bcb…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 03:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3feb9e1bf4ec2fd81812d8c9bea3e5b0 SHA-1: d186b195ffe05077803fef8bfcf9f68b3b15fd4e SHA-256: 1633169b3e914bcb6507797e59c597bda02ce3f2788397c813c813de55667a42
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and points to compromised CMS upload storage, indicating it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=how+do+you+block+numbers+on+androids PDF link annotation
    • https://mb-classic-service.de/userfiles/file/vunuvo.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/86202174523.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/9986976189.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/67549882596.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/85717576739.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/tizafevinugoribabujariz.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8a0b577b55a3c7690756987f93df6e59/buxitisu.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/puvituriwa.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109060815541628.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/sagobakuriliwomarisal.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/16951337511.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xilojaberitenut.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/96324096720.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/lubufelunek.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/topusitabisixa.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/95282833538.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/43607638449.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a93b5a10278fed8500b399c5f7f591d5/naretutopesijesoridu.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/gavuxidos.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/binapirevotodazikow.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/letowubazawewi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161360eab037ca---katazozuwi.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/42583087466.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6221766e1a9b2a34e72f7514a4ba8cbc/kidonewivitamowefe.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_off0000b44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5C 14884 bytes
SHA-256: 770553d2f71f5e3ff61465d2732c05b34e6b9600c504ee2552a643a772379309
font_02_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 10956 bytes
SHA-256: c699546c3c294f223317eb3f16c30a28e4ad8bbd26a3ffe0085029e7b21ff4ba

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