Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d6d4b4785ac19a…

MALICIOUS

PDF

72.8 KB Created: 2021-06-28 03:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d56368cf411686dc9e44164f95556a55 SHA-1: b70852055eac828ba1f0b55c020a47067b6d58d3 SHA-256: 42d6d4b4785ac19a14e01be3975cf20efc34d2924b6dcc130d0928443d544541
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves exploiting user trust through these links, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=hello+world+in+spring+boot PDF link annotation
    • https://agrilaui.com/userfiles/file/15906400368.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60df6e4b7---dolumudexopu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk4agsc32q9d3qtqepn6f462sc/70223873259.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/munudal.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/riiptjm3dnnqd6r5o39bfa7l2d/pefederolirukuwedub.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/93947957498.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9h1vgpk47h7o5nnsh3knsmgmh/nifazufeno.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/podidabekibofewi.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/46980417786.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9465dckbrn5pjrmf233ol14k6/rigegarafapa.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/77608673459.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d66032cb6bbe351d0563efa9c36f5258/18318783920.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/livuge.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fe5536a29---25399461897.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/32692637648.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/xoganipose.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce403d0f3---87331831917.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/jometatalawukuxave.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/20643035863.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/gikaxot.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/86649116813.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/seguto.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e36b0b70a---wikosunutafuzutej.pdfIn PDF document text
    • https://medtek.vn/storage/file/13379329471.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_off0000bc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 10624 bytes
SHA-256: 064c8b5507ae244717ffd50918d54a859d2ebf7774f87dd66053e2122b5817a0
font_02_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 16160 bytes
SHA-256: 494de5c44d1d39d9797f629c50d0f78dcb2a5e0b0a32493f46455d0190d04c28

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