Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd6ee403fce6287…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 21:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8fe66c59b3fb139f0972e0b728d8f84a SHA-1: 3c28a585f4f5b8f3c3158e669e2a1d27d1661122 SHA-256: 4cd6ee403fce6287b01a173083a2f4a9156845ac90ca6731f5a5430a773666cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://cbdc.co/uploads/ckfinder/userfiles/files/67157408926.pdf In PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/38951916927.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/gixurotibujiv.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/72697799018.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/sawipimiwadagosus.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/89927520855.pdfIn PDF document text
    • https://pcetravel.com/files/file/16633881341.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/perofelokotopavewaf.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/16668820590.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/balozitekolezobavukajudob.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/dadamasewud.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/sedokemerulimeretasur.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/80181252843.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/nixekamevaxowewuxetok.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_443BBBE51387508A.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/18996628948.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bf6ce0824bc64ffe368c32466473ff5f/pubedajakikad.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/vatago.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7871d9f1f3e9fb929b437aab5723d820/fusesofejakaraz.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/mavaxaxeji.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/50565842066.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/lareniwedozaxilineri.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/natukovexo.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/55273949918.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/30375595912.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6717887e---kojuf.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/40990553986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+send+otp+to+email+in+android+studioPDF 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_off0000b33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 10728 bytes
SHA-256: b4d8844041e6716d7ddc5567f29b5d5378224aff109e037a4b920975866034d3
font_01_sfnt_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 16464 bytes
SHA-256: 580a112a618ce0c5900b44425011a70da492a05cea7b384e5d3661290c0f6781

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