Malicious PDF — malware analysis report

Static analysis result for SHA-256 6435f0c77d7a1de0…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 23:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 438d0e99c6639fc1f1bb99923ea692ad SHA-1: f4882a543cdccbd286163f00e96504c88037f69b SHA-256: 6435f0c77d7a1de0d0965667d30a0695bee9fad8bbd700bddcba408482b8cb37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to lure victims to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://sun-green.be/ckfinder/userfiles/files/35203995256.pdf In PDF document text
    • https://pristineleather.com/userfiles/file/71820823002.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/60380856754.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3e2e18655---ligekabopomarewekokadabix.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/xisovoliwud.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109090426072426.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9bed94950ec95ad05e2f01bc66dae265/bixupesetodibodakisi.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/80064945871.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/11614785192.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/mavekikojexifa.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/78874828919.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/75937774163.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/lokavelomilokoxegaji.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/62729278259.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/mezozituwuturimufeko.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/muruwuvusorebez.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/98570089852.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kbj3m5a3bpihdt1nfddbvjev9j/80919391931.pdfIn PDF document text
    • http://bamor.org/userfiles/file/26412390949.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/juvopinigakotijisube.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/871087840.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/lekakubedivezazumovore.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5ba2809a5---bodibibadepamozasuf.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109062217532178.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/79707308373.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/9454669744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mejores+juegos+de+conquista+androidPDF 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_off0000b6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AA 10868 bytes
SHA-256: 814febf887e8fda451d2fd19d01767dcec247691fc56775f4c676927c878a4cf
font_01_sfnt_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 18032 bytes
SHA-256: b7724a17d22b56fb9c5a12aef8aa40021202fa1379b67494426cef0ebc5cab47
font_02_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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