Malicious PDF — malware analysis report

Static analysis result for SHA-256 9232288c75d022a1…

MALICIOUS

PDF

87.7 KB Created: 2021-10-09 11:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b8e4933ae4200a886773d4594ab2105 SHA-1: 0b3b4f0d06ddeab6a746737e5a97c0b60e8b01e2 SHA-256: 9232288c75d022a1ff587aa75b4262ac8ee2b49f0f00fb56c7ba195f1ba1cd54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://yas-center.ru/userfiles/file/fubow.pdf In PDF document text
    • https://manorhair.com/uploads/files/202109022302028796.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1615fdd39ee9c5---zanevowojit.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/51646418666.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/17953100583.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/bogemuliduromujesibu.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/jozexeribat.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/lubabovunekuxipemasupom.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/pekose.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/66048602113.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c46d9c08941f7d962ab2c2f494ccac41/kubozumipuz.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/11095380266.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/23663290056.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/ruxarelojofi.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/91045190349.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/wilexe.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/tinosekivuxitinejunivule.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158a3a6ac7df---fegizekof.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/16274790617.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/bifimoga.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/jiravumojom.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/tafoxuriwavoposewovoxe.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/87660075442.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/gujataladimotivitovag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quantitative+methods+questions+and+answers+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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 21380 bytes
SHA-256: d97753dc942ced13b84aee126b137747480748069963a77a6dfb29c750c5c605
font_01_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 11176 bytes
SHA-256: 5fa3c08ac2245aa10eaca7df3da6dd4f8b601fb725388e9f3fec720db6792e18
font_02_sfnt_off0001393c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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