Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35833fe5a625309…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 19:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd159833e5bf8aa372063e3a4b3e2f9c SHA-1: c6f16fc58a8a4bf1f795b2126ac52d91bd39aad0 SHA-256: d35833fe5a6253090432425ad5f42d02e030c3ea8554de23a7886abdee7f862c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=the+millionaire+fastlane+pdf+gratuit PDF link annotation
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kesufuv.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/37550149076.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xoluzizi.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/sutazasivomatudozet.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed5630432f---45408082800.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/93154685594.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/13258258546.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613c74a18cab8---busasodulumiluwo.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/gitefogijixi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/o5qrk9vcefk1r8kri1qgr8okd8/kapuba.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210905_021138.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/56180151596.pdfIn PDF document text
    • http://www.og2c.com/images/file/manefebuzaduvudolozedi.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/74008126275.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/1023059622.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/dejasivar.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/vutaxipimibamopabo.pdfIn PDF document text
    • https://cf2019.codefon.hu/js/ckfinder/userfiles/files/xoliwigetuvoranil.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/76776024764.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a6c9283a4faed283a9dcfdcafbc2c0c2/kowagokobunujitusovub.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/wamozopavevozajipoterer.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3eue8rdh6sjgt1qu0vrrd3c9t6/wejupebisegokemujodo.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/23972769870.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/86969490094.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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 11008 bytes
SHA-256: d1d555de2035c289164f54d065dc8351b3a7a9062cae1998c87cd85bd0e611c1
font_02_sfnt_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 14852 bytes
SHA-256: 52fd620163076963598d5f34baa93f41971f81d081a5c466f654a84eaa3e5e61

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