Malicious PDF — malware analysis report

Static analysis result for SHA-256 df33e6e88e6d3bfe…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 04:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad5f18c919057b01e4f955450d7fcf6d SHA-1: 538a524a77209c2f39e0e663186722047c0c4da6 SHA-256: df33e6e88e6d3bfe7955d05cd599576d6934a16c9666e89ff519d7cd8daa0230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://aulacvn.com/upload/fck/file/6963600709.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/wupapurivaminavafinalorim.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160906697b4d25---13937642568.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/39369721028.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac350c420e---lototutowedoro.pdfIn PDF document text
    • https://dm288.com/slicice/file/74600594612.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//5454275948.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/rebitesuka.pdfIn PDF document text
    • https://le27.fr/docs/file/39156469431.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/lexiralosurerekavo.pdfIn PDF document text
    • https://robertbah.si/files/file/potepojav.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/fefujojaditukemogovaj.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/nujagiz.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ausd4ktd4fbpcqsll6t5g4v12v/47366230054.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/wakatisodekoz.pdfIn PDF document text
    • http://easy2ticket.com/upload/files/91002549010.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mmn709hm34f1f94vi0hjtmtl72/77817478686.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/zerakiwiva.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jafadatimimuwemexuzadom.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/89552321685.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/71161037065.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tifukesixazufewekoruso.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/28628292195.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/15406464506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=a+measure+of+dispersion+is+alwaysPDF 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_off0000b91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 10844 bytes
SHA-256: 1a829e44400cfe69ec68248bacb84f877267bab63fd91bc8d1eee11a79e4b09c
font_02_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 14548 bytes
SHA-256: 743ea6d9a38ff621570ed8a773f222138e61cd1d520675f58fff792b6d6809d2

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