Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21b6ae93655fbbe…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 14:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b898cb4a5127b399be4f39edd1938d04 SHA-1: 70ce5c0c05a223633728f2add7c85bcaf5439f7a SHA-256: b21b6ae93655fbbe57539e676422ccdcbf4ed07eee4742f2aed04445abea921b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links, likely to trick users into visiting malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=after+we+collided+book+online+pdf PDF link annotation
    • http://friend5190.xyz/js/ckfinder/userfiles/files/jugovusugetojiroziw.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nijadisoligi.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/59208148300.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/pafizewigiwoxapajone.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/71141616380.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/nadabimobibivik.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/vefujujifarujej.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/90055222282.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909232641.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/67524467463.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/nopukinezagujimix.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4bfaf405cd8cb16bd0c5ca92e280fb44/fasaliwunaf.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/73607204754.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c9e1bcbf---putuvuwarek.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/relodozavij.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/ragavagegojevuz.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/lazunuv.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b3ad9bb743fb6b651ca602da116bee3c/terizifavuwipebazadope.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/majewidisala.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/86806553175.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://bidmitt.com/img/files/file/wuzununubizap.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/82828424219.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210903150644.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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 18184 bytes
SHA-256: 2fdae26cf235e07d06f3098184b97bd17bf0227b09a68ab7220f4a7e23b84368
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 10580 bytes
SHA-256: af14b402b8f96657c6583e8ecaf405f1134e48e408577139db6f32317dc2bd80

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