Malicious PDF — malware analysis report

Static analysis result for SHA-256 8289eb566cb1fc96…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 00:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11a663e374a1fc8f9329c0322bb52553 SHA-1: 992640c9d316c87510c5b2b8a02f09f0f55a376a SHA-256: 8289eb566cb1fc9639b3f58621a6b525975e756ed33763dd0030ffd7bd8b522b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://matricula.netlandschool.cl/files/68434339989.pdf In PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/91807088347.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614997fe61e14---sigefemuvizukuv.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/jorusuv.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/fixal.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/29818276897.pdfIn PDF document text
    • http://thongthien.vn/upload/files/xugefopazojegarivexuzili.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/98394533791.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/nanekawodekeki.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/63001989138.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a79rma4p7i51oid26egovvngqf/wepikubudobunolavunavaz.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/13371884969.pdfIn PDF document text
    • http://halaljones.com/uploads/files/54557232944.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933337728e---xikivesim.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f260d7e46f---55760475684.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/xokunizupemuder.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/67101516875.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wogosu.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/zepekasemamejiludogokazux.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/wilovitimapunix.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/79051805997.pdfIn PDF document text
    • http://lagrupacio.cat/file/selimozasepez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=paw+patrol+the+movie+123moviesPDF 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_off0000ad86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 10908 bytes
SHA-256: 31ba9fead444213b3468f07fe17f3e833ed101af4f0bada02ebe3c601bc41d7c
font_02_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 14684 bytes
SHA-256: 1bf7a33403180cc48268214aba59542cf6d475ad936d65ba71168979a9654585

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