Malicious PDF — malware analysis report

Static analysis result for SHA-256 b341bf0bacbc6a94…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 09:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84529840eeb2ab6e79997c752a451da8 SHA-1: 9db36160baa0589ce80b59e6fc1c561e94f5f1c4 SHA-256: b341bf0bacbc6a9416873ef3650d4033b3fc2a53c9166797c6d2c6df679c0e99
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various domains, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://rivieresoceanie.com/ckfinder/userfiles/files/rogogofutujew.pdf In PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/10859573240.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/bejewuvogu.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/nuretorivi.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/nikixulubizala.pdfIn PDF document text
    • http://timebymtm.com/upload/files/88892274787.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/76776024764.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cf7ac544121d9aa66ddc484f78c65802/bikiraxe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140617306912---manodudixobomomewer.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9c7845ca1b705443809ac07854551d13/jotegedilusopazafob.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/19007146998.pdfIn PDF document text
    • http://altus.pl/userfiles/file/ninuxibokofef.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/280306492.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151487a04056---tomutidumiz.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/16481a88b599871bd61b616a9a09201e/xukanagiwepemesexa.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/jikapukudabap.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6542f5d9---zusakaxugakitexuvububib.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b689bf3393---67993314864.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/muwulirol.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gativazutazeguk.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/75249436117.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zodufoposubavu.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/tudowasakolereku.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/48897649055.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/90435254188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sa+mp+androidPDF 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_off0000bf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 17756 bytes
SHA-256: 61ab1c9587ce7f0810923b40ac7b126a3d1339e2defd0ee1e063109684c3f348
font_02_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 10184 bytes
SHA-256: 95c22c0bac7dae7527a814c0421722bee4fc8ea7ca6d1826bdc69c93534e6445

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