Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d0369a8fce1a21…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 02:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa2d8e98d427139c2720fad2ceda9df3 SHA-1: 4ff05397a8becc9ee28f4b695498f276299bd356 SHA-256: 39d0369a8fce1a2145a6e5bbc2a34161b09eade21924e39eae2e35be0f08b637
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing an embedded JavaScript stream, which is a common technique for executing malicious code. The presence of multiple external URIs, some pointing to compromised WordPress sites, indicates a phishing or link farm attack pattern. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 https://barcelonamedicalcenter.com/files/galeria/files/24839071175.pdf In PDF document text
    • http://vtaky.sk/media/file/74424217456.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/946218986dfcc22559cea22f26d29de1/juzufe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/38b7964a8589c88deb054191a0137c61/1298303013.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/vuxugarajozisake.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/61305267013.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2998c14e328c4ed4c0fab65b586e76a4/89724047908.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/gexiruvivujulojodumef.pdfIn PDF document text
    • http://sentai.cc/data/file/20210911_084259_997.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/boxisobadubetukon.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/43653588973.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/26311535552.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/33623187886.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/88950449807.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/2920d3.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/49412635208.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/29102093810.pdfIn PDF document text
    • http://analhospital.net/file/files/xozurobafekolara.pdfIn PDF document text
    • http://santeh.md/img/files/wajijimole.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/43244605714.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/37895541080.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57359ca66---jifudusenaxarezide.pdfIn PDF document text
    • http://zl369.net/userfiles/file/58091360563.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/8qs6t4at1n5i9fs7dukb1v5v4s/mavibudoposafopoderuzugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+turn+off+ads+on+miui+12PDF 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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 18384 bytes
SHA-256: c38b42282ce6cfd4e303fd87b3f45f02265615c845cf0cddc0f09080795f354d
font_01_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 10684 bytes
SHA-256: 3a4dd271d3ad16325667a208806b1a8b10fc30d33435a905ad02ee3d6cb4efb1

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