Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fe4bf19793c540…

MALICIOUS

PDF

90.7 KB Created: 2021-09-04 19:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fbeaafc7cee8d828424551477c4a45ac SHA-1: 162ddc13528d602f8d1e0749735c5577c8f82e27 SHA-256: 90fe4bf19793c540c82ed674ee5dae6abda19b5cc61acbe3ef1563d0f12690c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kingdomofgodmn.org/userfiles/files/88291085651.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121007ea1469---kexixome.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/77539434233.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/vekumajazizifavekenuz.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/18367467569.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/57118104444.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9943d8c2a---67508289686.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cdpcj112e5trl1upomn26mofqk/fazajo.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/nikaxazu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c14e8d4ed021b252a148370bcbe39c5f/vedebedugibo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c8d5f327ae4---7436430853.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/86406174876.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6741e5b6---93799711481.pdfIn PDF document text
    • https://hiroyoung.com/data/files/51645468078.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da0b78cbc1a3b435daaceb1727c6efda/39278950979.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/rexajosuravegabafuf.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c9f09f3f---90405695483.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/simuzowifiteko.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kegobejafowemogo.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210815042104.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/96894824712.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cf463c77a2b777223ea335b408a88c93/99004924932.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210826080828.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/48086364121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bfg+story+book+pdfPDF 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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 10536 bytes
SHA-256: 992dd023a9863fb512de01898f92b1b0ceac3f92327b8b7513f3658dad2b5c92
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 21828 bytes
SHA-256: e6b557f11e73f571d9ae90e969522a42615bf156e8ebd62a88f460b7792ecb98
font_02_sfnt_off00014580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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