Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8ee9275dc54138…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 03:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3d90eb5a4a7e3c626b355ebe0c70e45 SHA-1: 6c535bbb51d89c762a3d928bfaf8b720c59e054e SHA-256: ec8ee9275dc541380073164ad20e863b273aff49f6d8d23182fc5410dccb5cbe
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple embedded URLs and the 'link farm' heuristics point towards an attempt to exploit user interaction via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://shidoremicrosys.com/media/kuxuvopixubagetimuxujon.pdf In PDF document text
    • http://veronikavilla.hu/userfiles/file/fowafinidunojagezovep.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/wazitujigemakilele.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/sudaromabadomafako.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394cd524b02---padovovibanatatejesiwob.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109081147541014.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/68196670425.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393115e36e2---falibibufuxifisalakudimu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/62998e5e2234755e90ce2ba46ed81f59/zidedutipuwewavafefitam.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/99929109055.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/nivagamujivad.pdfIn PDF document text
    • http://c-amc.com/upload/files/xuxojaxu.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/25497222237.pdfIn PDF document text
    • https://auto826.com/uploads/files/sepokoravibagurix.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/67622356582.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137709c13b1d---gusuxubupuza.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061320341071.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/fojefepamisitosazesoxo.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/nenukekarumekalasimoged.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/6651222582.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nih86slvk7nm33br696mb2j7s4/fikesosigedemawonorez.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/10983937331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=qr+code+how+to+scan+androidPDF 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_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 17556 bytes
SHA-256: 0711372cf892d17b026693087af72798f17970e24578bb898074fb1b89838445
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 10564 bytes
SHA-256: 56c4ff01f2f19819175e9d29179511651cc7db1455159e2965befea26a4b3a1b
font_02_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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