Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a6083e83b369fe…

MALICIOUS

PDF

86.0 KB Created: 2021-07-14 07:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c269eb1101c2caf4aba154494eaf9243 SHA-1: 9eaf0ffbdab7c15ba2ce3546e028400512c71bf6 SHA-256: 63a6083e83b369febb842d92062d9833af5c65d466ccd691b84cf99298435615
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=how+would+you+figure+the+number+of+protons+and+electrons+in+an+atom PDF link annotation
    • http://anquocrealty.com/uploads/image/files/zugegegivaxefadajisisapaz.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db204603d---58487172578.pdfIn PDF document text
    • https://t2sc.me/userfiles/13450804951.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/47767547273.pdfIn PDF document text
    • http://mp-journal.com/media/file/zalesikuvatowusuze.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/8e53999c5231ef901bc75bd114cb7570/mojosawudomu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fcb030126---66989915307.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/31d04808aac70d8138886ff7f7d531ac/15541723290.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6g1h7iamirdbhgdcdfo4s6cq3v/1903374631.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/tosifa.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d3b22169---90155653066.pdfIn PDF document text
    • http://gtshotel.it/images/file/20412124265.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uvdejg6rea6cd1foinf4petv2a/dalugur.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/26o09861h81ru9fc48ete26t3f/xijeruvodugizezupikil.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/11187928437.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/86767961064.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/dddd070f3dd3a62bd659db4dd178f2ad/dunuwinadokegoli.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/99191258618.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7afdbe5698fc2257c4cc0f6d82d71d01/56573354649.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/5741636081.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/jakezagazonegagozexu.pdfIn PDF document text
    • http://prosquash.by/data/gunikapisobepube.pdfIn PDF document text
    • 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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 11496 bytes
SHA-256: 3207d82f7f83d4453d21de4dd9150351d69f6ff2f2c11392a6bfdee73c69c7ee
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 16780 bytes
SHA-256: 0abfe8fe9a06df6a1e8dc8efb2788ca3fa30c104afcd733ce1bd86d581c30503

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