Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a40fe3da42a518…

MALICIOUS

PDF

76.1 KB Created: 2021-05-30 19:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6f7df8c0e5a9e18316eaf000b8d157a1 SHA-1: 6b2ad9c2e4f50c6d5a85b3f65cb741b39a4da949 SHA-256: e1a40fe3da42a5182dfeb2aae09e463b1018ace15e72caac33f6a2e06ffc0fcf
156 Risk Score

Malware Insights

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

This PDF document contains numerous links pointing to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm. The document's content, though heavily obfuscated, suggests a lure related to game codes, likely intended to deceive users into visiting malicious sites for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59ad5ad6a---lipetamegizututadobebe.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1864c3744b3255779401823b680350ab/nivanuzijujo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/logojasip.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/28162432116.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7a3240d1b---3130398446.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2ee9ad19---nolezesudife.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/33975810612.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2afd3c35---wapoduzekuzememaw.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/94175887042.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/af7f3041a5e2aa0b2211368b69649d9c/49602019184.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/nibitoniritid.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b53c6290---xorezelini.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/zuditaropusigixir.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/8522998935.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160763f28791f9---dizogadetujit.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/58d6ebbbe279f1c60e942b32b0dda431/dubod.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071493d7c527---16763828246.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/46349394958.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b3a57d3da---69767742463.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=shark+cards+gta+5+xbox+one+codesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 5668 bytes
SHA-256: 6f8a7bdf5567d413eaca5e08c0b1368c1917b925be53c5b3e4399fa53d30e0bb
font_01_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 11140 bytes
SHA-256: 0278066c10c707a85224ddfe5f578731ee3a99709eb21e581f5b75ab5bfc292c