Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5c7ede96fbd4d1…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 20:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c21c2cc2c951094cfeddbd6bd5e4be6f SHA-1: 4bd1a4e7ec082baa9eab3a40793a9e03cb468431 SHA-256: 5d5c7ede96fbd4d1ce4dceebf6242ace31d1789495fcc23fc6b1f3660ccff65b
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 document employs a social engineering lure, specifically a 'Browser Install Lure', prompting the user to install an update or extension. This is a common tactic to facilitate credential theft or malware installation. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee9304072---62486222996.pdf In PDF document text
    • http://ex2010.com/uploadfile/file/2021082010015673499.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/vezipavuvikoluli.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/jisolepapef.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/pomuzixizubaxawegovi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087dbacde1b5---3300523109.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/50676208607.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764cb3228df---lamebinatoz.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3d9011686f8e6da294523cc0e8ac165a/nilivojeneruzoluniwili.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/wuneruvukireboj.pdfIn PDF document text
    • http://ubest.ru/images/file/guposekasilire.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfe331c13---99926117419.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/32190434682.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/rokubobijedibuto.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/34999567008.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/witozep.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210804024610.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/h217ogurcllch0gjtf1nustmg1/pozonixigivizirerikeg.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e3278cc1---79950858577.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/danemonebapuxatija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=image+to+pdf+converter+less+than+100kbPDF 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_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 11396 bytes
SHA-256: 9e6e6e2c95b192f8922dc5f0256791037097d9006c993b24b92b03b712233f78
font_02_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 16492 bytes
SHA-256: 915bdcd420b7aeb882b40e489d932d6a981528f102bfbeccdd2f4dab543bf2c3

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