Malicious PDF — malware analysis report

Static analysis result for SHA-256 6897aa4dc6e84b2f…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 21:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b5cfae30cb91ed46ed4ad0ec12439bb SHA-1: 6e1c890e90161e7910c9f40ff1caf5d801abe1bd SHA-256: 6897aa4dc6e84b2f2f0f737f3616ab8576750db4184f2c24b04e7bb3921c00d6
196 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 a machine learning classifier. It employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common method for distributing malware or stealing credentials. The document also contains numerous links to potentially compromised websites, suggesting it is part of a larger phishing or distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef77efb0c---63831127321.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d846a60836bb50d81f698484783dabfd/zemedesinelizipat.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0h0jnajcviaaq9imb8gg731kn6/xasibigotiranurafejov.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607108463b782---rivadepijitulolanetitaji.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8dd120559619c9520190fee20fd8d010/22679519378.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb607a9c2---79661878936.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4fac2f6d414e031b72091b7b3d95420b/vogifizedokufifase.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4841aba0a---1550125559.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/vimemag.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0d84ec31---73556109670.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69591685ba---wuzogisetalibogi.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ea3f3f5d5f952054e95c35f3c80809ba/pevenifodeximikoxirosuki.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/nu78kls8l52tmkcv8s7gd81avb/42432781288.pdfIn PDF document text
    • http://bronia.org/userfiles/file/jizupol.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/65509908967.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/linesagobobak.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1aeb45c7bc0116119beb9a2819e72670/jopetubuzawuwomiwexegosej.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/76414316841.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/23848912936.pdfIn PDF document text
    • https://csn-alliance.com/data/files/megovi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f972f4ed0f---84014706059.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608df45097076---65723610146.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8996c70---82597077711.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/45193630672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=google+play+store+app+install+for+macPDF 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_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 17012 bytes
SHA-256: 61dffd282d9ca6f35bdf15114f46e5412805d07fb487cc87960ade310ee8a9d4
font_02_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 10976 bytes
SHA-256: aa090c55538cde29dc9d9e5f2ab3c19c3d1ccc195d0c7441e6ead2d4e08d47a0

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