Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87626eef0495258…

MALICIOUS

PDF

87.3 KB Created: 2021-09-11 05:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8842b2777998375fc4bed02d81ae487a SHA-1: c6f45720f86f8650acc816f6ab2a3d02cf284a25 SHA-256: d87626eef0495258bb7f2d4f9ce343fb5ff6e807a407d0e8554f6871cff2f611
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. The embedded JavaScript is a common method for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lmtechsolution.com/userfiles/mebakajom.pdf In PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_944DB05B57E20B13.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3d976b1520b02b008432c56425c44bfc/niwad.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67794488252.pdfIn PDF document text
    • http://epmachine.ru/d/files/vikes.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/60095767527.pdfIn PDF document text
    • http://runhouchem.com/upload/files/seran.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090914285170554.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4c038870---nuxanaguxururet.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/memufevokemesupukupikusij.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/90568816709.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/624332131833e8e44c06681647b780a5/tewemimovukavalojavajav.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/72045414772.pdfIn PDF document text
    • http://serting.eu/userfiles/files/37770506954.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/rularuxubupo.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/46000964031.pdfIn PDF document text
    • http://etre-belle.su/images/file/87908454369.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/fokovajij.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/falimod.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/dirodiz.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/4987265181.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/donetaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mv+master+mb+masterPDF 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_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 19636 bytes
SHA-256: eb45c61eca28f50b9b098671f7efa18f9ee773e8089ff11d1c037edd8d526179
font_02_sfnt_off00013904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 10104 bytes
SHA-256: 804754f4e3669b962a9b057a2fa688cb8af44e874c4335cdae3639134460ceb9

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