Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c9e04fadebdb0a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 10:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 013256196432f5600909dfef790ecc0a SHA-1: 22529bb6dc86b33269e5fd3222037666ab7535c4 SHA-256: 80c9e04fadebdb0a7469a209db69211ae05d91800677231f5576dbeb7e70e44e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites to host files, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to redirect the user to malicious content, potentially exploiting vulnerabilities within the PDF reader or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=chutes+and+ladders+pc PDF link annotation
    • http://zulaikhatextile.com/userfiles/files/46335913060.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0db03044f174447b7e0e962509ff1726/34949379020.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/jilodomoporepek.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/jatebituzazisun.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/vokefobilapige.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/xuxadixu.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090620145973499.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/giguzune.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb96d28858---6915846327.pdfIn PDF document text
    • http://favourtec.com/attachment/file/39314036158.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/3966857475.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911080114187307.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/dovilumumutal.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/20988178920.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210916_133B7B412168EB53.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/80582255495.pdfIn PDF document text
    • http://186086.com/upload/files/10402490115.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/12916755364.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/91019632093.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d3c76344ee538c422ff421388a1a793d/boxenesizozamopogiveku.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/vadowejisokaza.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/25720068392.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/3183861139.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 17592 bytes
SHA-256: 111b2f685adaf923390d81dbea0c5e10a21a0e99c778e6555c05606847f39209
font_01_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 10528 bytes
SHA-256: 19bd08a0054a82f251211c62a467c042f4e382bfc64798c2dc2f1dc8a1a8b2f3
font_02_sfnt_off000134dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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