Malicious PDF — malware analysis report

Static analysis result for SHA-256 a950e6ca914919c4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 20:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7f5e7ab8821f157ee2299166df91dfd SHA-1: c68183e9116f4eb1f72f12ea20dca0f0eeaa9053 SHA-256: a950e6ca914919c4dafb8671d8ca0742f295fad4a22f686d7e348594d300953f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads 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 delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://opuspoint.com/ckfinder/userfiles/files/pevakaked.pdf In PDF document text
    • http://mariancozma.com/_user/file/9278727981.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/gomafukazozexufuwate.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/tiwizenozadefaza.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca94ae9902---wozopala.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/41015440989.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/zofonisokexegaje.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd796f652---pasamofiviwikij.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/lukodafuv.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/64e27f4523dfd69b19b729f6c9dfa5f7/68347726351.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/49152887503.pdfIn PDF document text
    • http://freeorden.com/media/file/89925649595.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajemax.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/79820771194.pdfIn PDF document text
    • https://isleo.com/i_photos/file/wupezegigefulegebefeweguf.pdfIn PDF document text
    • http://sdes.in/uploads/17433839949.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/kixevugu.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/90913797475.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/lotetimiruzizox.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/puwed.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/tebisuviberogok.pdfIn PDF document text
    • http://kme-kme.cz/files/file/85616535096.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_165628_143.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/vovafovugogenajaliril.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341eab977b9---ravarevawafugotafipakimid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=games+to+play+on+tv+with+phone+freePDF 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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 10928 bytes
SHA-256: 03df7b271a7c1347bdb58e9ff526f811f4358d1d2a6d2432d500d7b71afe4e89
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 17540 bytes
SHA-256: 98e1a214cead36ae8a01cb037bd9b374a7c8f3cf00550be401485dbad7046616

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