Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f0b5ce9215eb60…

MALICIOUS

PDF

84.6 KB Created: 2021-06-14 16:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b6fa9e4e80b20e50f5120a8f8347908 SHA-1: f9aceb9e4b5f9a362d642d7481013ef374025789 SHA-256: 93f0b5ce9215eb60258dad83a67aceaa871789fcc1a3da4255d4436e41b24b63
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting search engine optimization for malicious content, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=7th+grade+algebra+worksheets+pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072eede63f35---wijepuzowotobevu.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba455fd297c---faxobil.pdf
    • http://banghetretunhien.com/media/ftp/file/zomivoxenegazozopos.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b084732c62---30081097210.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210601053255.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f817ef2b26---65709272730.pdf
    • http://svsteinfurth.de/radsportfiles/file/22198381517.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/aab8456e84353d481bbe8b16ed38fda0/roxegopudazuxemewipuwinuj.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0720af2682---57378055461.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/78268458295.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1722169e51ad4ee3052af45755537c2d/88813517243.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f530da93f9---kubajuj.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080650dae993---33683325375.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/8d5d6807d7be74c74e923b7c353c56a2/22474995258.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/13959289496.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609744f9a3260---wupak.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vqun8ngqc8ae7ft2ak99qg3r9q/kasuxododovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bd1.bin
ff97c80457cc8a233761fb61255731ae86d1aca2af67967f4894aae7cb499cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 5584 bytes
font_01_sfnt_off00011edd.bin
4cae237251b6ebafce02a58d55133d8cbab103ae928d5fbf35c7f74d30006c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 10972 bytes

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