Malicious PDF — malware analysis report

Static analysis result for SHA-256 c375665e6b81c6e1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 14:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e107ed98f5bd92d04a93660b63e0886a SHA-1: 13191906852a634eee3853c877f42d6ead0d2bf2 SHA-256: c375665e6b81c6e1715e1564a265b581614ea738bb8d1d2a393af1b830c2ee5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://oldadmin.k12cart.com/media/files/revupuzodude.pdf In PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/71631905740.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/78331259046.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/96408606454.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/jobadajimu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134765ea7020---zositag.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/4923765758.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/bogefuvubeku.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/nufipilelavuxuxujizoz.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/25349301064.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f013ec3628---12990117900.pdfIn PDF document text
    • http://bdn10.cz/files/file/97922709927.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/kipigeda.pdfIn PDF document text
    • http://www.puhito.hu/uploads/66311787751.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/tujasifanogonajusop.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96037d0f5---96324421782.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/64074899515.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/60539668939.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/forosaguduke.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b7c5aa27---4423882255.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad2724f77---kabutoxuj.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/38540555502.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/89759486120.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/kiwopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=automatic+cache+cleaner+pro+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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 10644 bytes
SHA-256: d7be3b511adb9ce38962f762ae71fa5b10d76eadbe6a6ec580b676883d8cc8cb
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 20016 bytes
SHA-256: 90d75da85190262a48c88c78df7f2e4094a2e89e8bf0153b9b1699d53097a82b
font_02_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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