Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c6be1401f5f27a…

MALICIOUS

PDF

77.8 KB Created: 2021-06-09 10:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dd122a3ccdef5e5f6fd0deb3673a0109 SHA-1: fd4ea5ada1794cb10a61ff5749eded859ddb298f SHA-256: 85c6be1401f5f27a95c3a97f4d116253b5dfc51980e088286e71635caf8aa7d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, many of which are hosted on WordPress installations and appear to be part of a link farm. The embedded URLs suggest a lure for downloading software, specifically mentioning 'gta vice city free download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://nomylo.ru/uplcv?utm_term=gta+vice+city+free+download+for+windows+7 PDF link annotation
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d912e57d9d24ccf2ac60e1a662560861/janumodomibo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2aecf856a161264871ec10b74ba065fe/jawetupe.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nedematumikatig.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/popejatizakanixivoxu.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/78190205382.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/72493091265.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51804e3db5---97477060592.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/69156377299.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6a153c2b1---jigigifawad.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742652d8bd8---nefix.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2e75ac53---25235434941.pdfIn PDF document text
    • https://nada70.org/userfiles/file/kefis.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/6297854372.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/90f598e7a8773f003fd582741fc5f295/88541156147.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2109848be---xanokomedurasixab.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kglap00qgeinhv6m5pcehhp9gr/20906018091.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/78969340219.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/47524250524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 5380 bytes
SHA-256: b5519ffd5d2016ee6c85d2e58f9474fbec2bc8c6289c4a118d8748a97c7aa39b
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 10652 bytes
SHA-256: 1cd8f1af749ee9fca38cea6aac5e664cebe4b672c1b947bb667215c892bc31c8