Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cbee9d299f9a9a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 22:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04639fdb9bb696e8394be7ac15c217bd SHA-1: a36fa2e10000bedd23be64e421f8766a97d1e8b3 SHA-256: 05cbee9d299f9a9af3d135e296d483c9c39ba282c14bf6dae23870d175c70b5d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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 http://3e-recycling.ru/app/webroot/filesfiles/81534980.pdf In PDF document text
    • http://sunarfactory.com/userfiles/files/tagivizelikararijaliruli.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077805930332---jizonakatunolajoko.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3bc00f48c---69400196931.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1eeb7906---8785292694.pdfIn PDF document text
    • https://bem-sa.com/img/file/wiseritegadexazibenane.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/71678255989.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737e1b94b05---wufebepubolovitaxaja.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/vusoraferifurigisotupam.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/rglhba1j5tseb2bpk26s14fdnj/bofokigenavabapepofezura.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607febedae114---36343307794.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b3c802c33018d02f79c0e76396df035c/69175086952.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/60041276814.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/92689897122.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/25969456924.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/25609237213.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/26049368233.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/4816803669.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf27af51c2d---kizisurufa.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iickaip592ungnp14dn4pi13cj/pinerolawemugijoruru.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/lebose.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/9060411376.pdfIn PDF document text
    • http://usagimatur.com/files/others/12641051820.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bc046d77dc3d81a57105ae78834583c2/bipudazejugivotekup.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb0a70cc7---bebokaferezuwe.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/vumogifepiwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=citroen+c5+2010+manual+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_off0000bf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2C 11172 bytes
SHA-256: e667ebd52ccbe9ea6542c73d5cc901a90c0577cebce7aa3d16ba0a685d8433ae
font_01_sfnt_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 17404 bytes
SHA-256: 61af4b7c386223fb39800d478d70f20e2b82fdd85a7d290566a26d1574feaee6
font_02_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1