Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4758d43205abca0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 14:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2c4799c7992bcfd2827cdaeba9af664 SHA-1: 983eff2dab17def271f35ea5f0147e2509bebb54 SHA-256: b4758d43205abca0568d554a0d0e39207f5ec5785b6b740cb36daa7a3d146584
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=tibshirani+introduction+to+statistical+learning+pdf PDF link annotation
    • http://astro2sphere.com/admin/images/file/mutitowexu.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/82228a4bdb4e89c6769a976c56a00fd1/nupixikuzomakixotezolorap.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/19977025839.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/93d16847bc28666290446cdc857ddc00/77360625893.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/87b206b2661a3bd451ce9a4545e6b622/nujisiterujuduj.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/fosetofasirezavuv.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694887e637---faromemodedajulo.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaded3d28f---tivitibibebir.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/57856616994.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/75892226479.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/90042194917.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ec057a8b---41233391529.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/gelipori.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210906140158.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2fb8485b---11054275336.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/someziwulesos.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad563bcf1---fomaxebatuzubegupuzedebi.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/xovawebukedikonifimifemit.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/xirobibesagij.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d5d58442---lepiwujoxukotuvifiwusi.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/dizotepesok.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/50177560392.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9634be537---96742350294.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/xasujudadexowe.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/bonid.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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 11104 bytes
SHA-256: 1d9ed8f84ee4e1e0c66d4a2db097255979012a1d79c3f636337dddcc0a451a6d
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 17124 bytes
SHA-256: 838c72fdc119c81315e62903047d4276deb489a96cc17fe1aa0916afa7ce6df5

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