Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23947381ab5b52c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 10:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a9cf28e651b8ae8d71768894fe406cb SHA-1: ec6cdba63a2d6b3078b0f988e61ded82f03fbd9a SHA-256: e23947381ab5b52cbb38dfbf858aa313de93891d084fd6d9f9d7f08e3ef58332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=great+dane+dog+group PDF link annotation
    • https://ahirealty.in/admin/userfiles/files/49689216264.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321ee39b11b---gedigej.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/8571267690.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92525780369.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/mijaneroluxibixe.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/bapojogigulitejakupitu.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/vezekabijojepita.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389f4289db6---nogorunizugosikoremig.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/7098109743.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/rasuzovolebosufomuloneg.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/negofofebubodurivutuxi.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/99437113389.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/23384762242.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136e223b7592---28953752964.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/kimapup.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/70780073801.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/sudasimisewufenopegupiwov.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rkkmnu16reumtn73u3q2sjjo1q/vefoluxefuba.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/sorajaginago.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/lofevaxajawesibutewa.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fapefelaka.pdfIn PDF document text
    • http://mestan.by/images/file/61750755429.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/puzulixunube.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b94538a24---40972668027.pdfIn PDF document text
    • 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_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 17356 bytes
SHA-256: 52cb378432bc5bce0e1d3c46eefa1a30d6fc2ab9315c80ff4edd137f7edbbfab
font_01_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 10400 bytes
SHA-256: 3945e73430398009103f12aaf3e593fcf9869bd77e386007ad7582140b5d8b57

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