Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e396946f62cd4cc…

MALICIOUS

PDF

83.1 KB Created: 2021-08-09 19:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3773a611b87fcf742614ecf58ae1125 SHA-1: a74f34f44d426d35def13c4626975588b5a338c9 SHA-256: 5e396946f62cd4cccc2533bfd1b7e4e46fdf96d08a80e3b0f9e89e28a9f34be0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous embedded URLs, many hosted on compromised CMS platforms, strongly indicates a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c8afd53d7dc3f3bffb8dffb73fbb0a38/67076702449.pdf In PDF document text
    • https://kildevangen.dk/files/gowowemezetizowopude.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5dfd6f86cf1545439b63b17eb85a5029/87350702965.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-24/20210724091033974686.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610f79e5141b0---2608980650.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/qiasj3ho5ua2l7kurt48k9q6j6/jeledeminaraxu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/tj6m5v0qcrf8hkhp7ulh77lg7c/40009611253.pdfIn PDF document text
    • http://bakoca.hu/files/file/41441322178.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/75b48182b6485c3bd3d0b72c90d2e9d1/38608797342.pdfIn PDF document text
    • https://daismene.it/file/nopebakilarimaguwor.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c1945af1---lanitaxanosikavewawimubav.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/2256826237.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/20156441752.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zofipi.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/10117085287.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/dokemuledutazilelej.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/66582469807.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8d0c7531165008beee6692f32a98b449/lisiranipazirumovofowifon.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/74972128341.pdfIn PDF document text
    • http://voijin.com/userfiles/files/9024654928.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/kaxazudixakogep.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/78984882322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=identidades+trigonometricas+pdf+formulasPDF 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_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 11012 bytes
SHA-256: c03ef1cda1f112912b98fe4a85f59de977e32ee89ac60385a13ff83c276947ba
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 16988 bytes
SHA-256: 803d81be75e8678defb0318be00ebe49e092b4e837138c00b87e28f194ba82a3
font_02_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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