Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca066fac95ec85c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 15:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c69dd8f66904f3558ba4711d0e3b7b8b SHA-1: 521f1f1c3e34ca482e64ba8bfcf13f7538aed107 SHA-256: 6ca066fac95ec85c917fa79af079ef7b5256d0d6b8a812e31973983a550b8b81
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://ayurveda-shiatsu-nice.com/upload/files/vigejedorizafepaburefot.pdf In PDF document text
    • http://studioriboldi.eu/userfiles/files/22375004338.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/tosuresokefuxag.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/xojefaboxa.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/xivizij.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/wurofuludazokulib.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/77592623308.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/24361645244.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/xaridafiberu.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/170334105.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6bef650fc04d331b389ea0856c98d494/xademagupavo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2ba9b5287ddd6503812c9e745b1470b3/powipebexalekunazewupe.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dubikedijexebaruva.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/1365033042.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xikepibejaxeli.pdfIn PDF document text
    • http://melabo.com/upload/files/zatinunobexadijeni.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/kawonetowolekeralojo.pdfIn PDF document text
    • http://shahgrp.com/uploads/57414862786.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/tiroxobopijomivuguzu.pdfIn PDF document text
    • http://healthywithhart.com/res/file/lukovumiw.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_67A59D29D0EC0D39.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613825947a48d---rugodegebanoburijagogula.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/pozalusojulagebafava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mcgraw+hill+ryerson+grade+11+math+textbook+pdfPDF 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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 11644 bytes
SHA-256: 5deeaa72d2ad0fb9cccef5ac76919edbe9aa904a71f455d1a4fce31f3d38dccc
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 16484 bytes
SHA-256: 5e2f3fd7a8b973903aaa408f891a949d7b6d115427b504817504561b5fd17382
font_02_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1