Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bb9f92803221d1…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 10:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4290c3039b0dcce0cf3c6360b89a8045 SHA-1: 078c4ae0ba50949ef749a7a73253dd221f168385 SHA-256: 68bb9f92803221d14987562e96d4c5d439fba71c38444ffe559d071925339d4c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple PDF files hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b69d2c2ed---xatejam.pdf In PDF document text
    • http://rideco.hu/upload/file/20840813737.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/68184964732.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/61030335435.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/16046672650.pdfIn PDF document text
    • http://juha.be/_files/file/2904633573.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210713_235131.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/4024926676.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2599f38eea---90263659596.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/wavajixofagube.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zudino.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ckfgh59ablnu5eh7itp2tgp7n1/budib.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873bfc474f7---furevososedaveno.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/burisowoxidojive.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ceabafbdcab679149af2600a81ba029b/xukaturilumoxopewanebe.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ab500d8fc7c5fd67ee688753d607fe61/zezipagirawafi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d08eb738c5cd3e7c6f3c6e21ce7c6dd2/69700169748.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e31c0cf0821cb40afec04fdf14bd1591/votojopajowi.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/20584462557.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/26935409529.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/muwijenopugudunam.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb03020b7---xofanukisewizixezafigasog.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/verovemorodixodititifeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=synonyms+worksheet+4th+grade+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_off0000beab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 15832 bytes
SHA-256: ea42b3ca52e0b99d90666ccb77224dedc7c5c7ec5f97e81f8ebebde93bd9329f
font_02_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 11252 bytes
SHA-256: 58be2103082c823f491ffe63b0101553c7f03b68a361ad24db04ba0e3f46baeb