Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88da1d6bd3496a4…

MALICIOUS

PDF

99.1 KB Created: 2021-09-09 17:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96fc09e55a90b1ca31461ec3a8ef6356 SHA-1: fc43f7cf7203c55699c2aaf9ddc5990a6e522d7e SHA-256: d88da1d6bd3496a4e6337e03478de123d621bbff602a7c3b8cc150450cc08938
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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.
  • 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://h1t-urlaurora1-turbo.com/contents/files/98216851160.pdf In PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/64093998545.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/65239616903.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pawedelusogimejekuxigaza.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/55685535886.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fb641ddb23c322fcda28f50cba782476/56360360213.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/kojotexub.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/bidojawo.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/24779348496.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/53249899666.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/87293386340.pdfIn PDF document text
    • http://masonhn.com/d/files/55678768703.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7eb5b445---xobotobosizelo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613424f9b5b4c---24606594561.pdfIn PDF document text
    • http://c-amc.com/upload/files/wepasafadula.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/supevi.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/fesalojuluxekorodote.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/1241159749.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/guvukad.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/80587288343.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/duvijanosaromikisisi.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/livufirimemulepu.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/tofinetitabiwolevusopizi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/44859130618.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613658875211f---sukajera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+android+application+using+javaPDF 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_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 18756 bytes
SHA-256: 2b1308afb2fef0075c4f64ef8c60b944bcf7c0db3e553b0300fbeaca12966a0d
font_01_sfnt_off00014beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEB 11324 bytes
SHA-256: d3de46e278b0b22942ad9076fa0486f3c4d6ba5cedf2e4b11eca631bbd4b6522
font_02_sfnt_off00016647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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