Malicious PDF — malware analysis report

Static analysis result for SHA-256 5982e74c35760441…

MALICIOUS

PDF

92.3 KB Created: 2021-09-22 14:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0e5e5e908aed1946bd2b428fcad6269f SHA-1: 833215013d4d1d6d3d427456a059df584d51cae4 SHA-256: 5982e74c35760441ca6afebafd70c97291197678b1a6653751ad769519a33ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/90872968050.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/mimapekexolezago.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/davozamixerekixafap.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/wasokowesojetobapuna.pdfIn PDF document text
    • https://phukienbep.net/media/files/pipisinepej.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161401ebaecd42---79289184742.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/6029750578.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89486103841.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210911071342_567055012.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/wisuwabimokitunuruwapez.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68b992dbc---668062241.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/58829679777.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/92674155925.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/nubimimelasebakakefexu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/mexef.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/26009618395.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/viniretibivedububi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44c2cc4af---73586718067.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6152a7d2---44222459554.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/kusagawotorakisa.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/goseminagizefibina.pdfIn PDF document text
    • http://i-dron.cz/data/file/47661664966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+android+icon+themesPDF 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_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10640 bytes
SHA-256: ea539e429d2b2e85fb27cdeb46e1f9bb3b11d1e592d09b2f6179601726b4dad5
font_01_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 18736 bytes
SHA-256: b53633d5060c84025ce954b8080c50ff9e6484569b1c884c6dfd2b174ed05485
font_02_sfnt_off00014bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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