Malicious PDF — malware analysis report

Static analysis result for SHA-256 8870a0cbf6dc363d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 22:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56da75e49fd2907024105f0a2b54dc79 SHA-1: 4766b8cc7ff98d70e030d63db01a18ad248986bb SHA-256: 8870a0cbf6dc363d3dd2b3cf97f5ad5e3ef79e4ac0d829d35021f9d0f55f80c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e38df0ea---vozipagutomarevumujezisob.pdf In PDF document text
    • https://luxm.pl/userfiles/file/roruniv.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/69783780278.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161386703465b9---supepenimamibumu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/22835133259.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/bikik.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/03ef9e024294ff3891b29e29c6aa912e/13670351220.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///32999998754.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/33585755082.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/novadimikamumezisavi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5566dcc0d---41236612870.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/42767861843.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/mofewanavowodeviredaz.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/96349209231.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jelowogepazixegutukomabe.pdfIn PDF document text
    • https://shidoremicrosys.com/media/42201710584.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/paponipizujamemukudagu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/23095513076.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/rixuxagajebupesajodemo.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/99888557255.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/rubomoxefudozoxebuzi.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/nojidopanabigabi.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/60163875444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mandalorian+video+wallpaperPDF 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_off0000b7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F3 10264 bytes
SHA-256: 57f28541b69e6597ca91bf2ac140963e8341eb1b87abb214a183aea79f545740
font_01_sfnt_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 17272 bytes
SHA-256: 4d59a94aff8a88b4f783f95c96d28d928b1c6d03991eb706da150d832f6ae36d
font_02_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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