Malicious PDF — malware analysis report

Static analysis result for SHA-256 a174bbd8be4fe7a5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 23:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a8fd7ba17f6e649f06284262270a9f9 SHA-1: 725c90428f43ea7734564a56ccf64b51b5dff119 SHA-256: a174bbd8be4fe7a5ad694a93dd1a45eacbfc26458f487f66da85b8c58c3e7cb0
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The 'Browser extension / update installation lure' heuristic strongly suggests a social-engineering tactic to trick users into installing malicious software or divulging credentials. Embedded JavaScript streams were also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://peiitw.com/Upload/ckeditor/files/50016318238.pdf In PDF document text
    • http://jinruily.com/UploadFile/file/20210904121808284.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1caeced8---87641141927.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/wafidusanalavadefav.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/tijobam.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/15455404573.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/79550575525.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/13069903440.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/kisanabujiziguboj.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/juwukodigosi.pdfIn PDF document text
    • http://ruihuitax.com/files/file/62303926647.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/levinakulozivad.pdfIn PDF document text
    • http://poiskvod.ru/images/file/66256199516.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/tosirixapigaseta.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/82170762988.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/33142308.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e9d89cb43eb2de03c2f29ff6fb8d0e34/fokufofopajexojunevej.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/26680660978.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/safopirewafoma.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/46805754676.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/93781936319.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ede75b7fe52727fe8ecf6e933444b824/wogamasoxagemipep.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/pomerusolaxesofepimulugil.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e49dc7d1a---4699032598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=subway+surfers+latest+version+apkPDF 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://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_off0000cfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD0 17876 bytes
SHA-256: bc0426df95cf9edbdc502d3bc1b9eba9f4d0ca9017103e194296d321f40a1e35
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 11024 bytes
SHA-256: 46c3e73bb85d6e33a144dd30194a837eda8dc88333ae7bcad22de9ec8f7274fd

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