Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece4572d20386ad9…

MALICIOUS

PDF

82.0 KB Created: 2021-06-24 05:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4188af3418d2eace054c086de5fb18a3 SHA-1: 47170505ee6c9dddb4fe25bf4bd1e15c8566e215 SHA-256: ece4572d20386ad994c50f74c7b58053c625f3458abd529fd4fb56fc105f186f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/l43ve4lsrvhhgucfu2s6lipd2k/zavivere.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160902cdf549de---55263291532.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a7d893c4---xozifasupegarasota.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/g15h36ouvq683qr4l6qavs9dst/62160168465.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ctp3gs2h05htgea00m6qg5b9t1/13647861171.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7980a6fd---15311543610.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/27882743712.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/92877288547.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a66314e1bcd---ganazow.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/9b6ec3002ed06772b762eef67312a343/74608827179.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c979ffadce778d0ab67d7cb73634ea6f/walufibojapanapofofu.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41470485343.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4522f16b71a3be3ac8772f80b2bece07/63433438006.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/73122699450.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ff38a58b76c65a898416e7908089a5e6/60073652173.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/bafigubawiralepebewagugi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/18977261579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=add+fonts+to+acrobatPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 5112 bytes
SHA-256: f8233a89db6c76f3076aa0eab2d73135decf0707d76fc3234229bc3bad3161fb
font_01_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 10872 bytes
SHA-256: 0ac804e911f55e5496f91dda29abcc1d69630cf10bae612ff8bb2725041b7b3d