Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b8f7d7be1cd4bf…

MALICIOUS

PDF

117.8 KB Created: 2021-09-05 01:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f02080ff5a3217e2af5b71263dff1b9a SHA-1: 8f1e05143468160f2e20cf699b0a2c67934ba86e SHA-256: 33b8f7d7be1cd4bfa45edd012d58833d68413067a8adcdb7f35c71ed773b3722
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript could be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://rabotatver.ru/userfiles/admin/zulonizexizowulo.pdf In PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/fejugapawavegifezojesep.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/soledolonuratapagur.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ae81e82974b2dffa147d55dcdd33636c/95578246501.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/19891776009.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/rijera.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/43565060193.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jegot.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97db4b7c37---32510375412.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/20224373917.pdfIn PDF document text
    • http://belst.by/upload/file/larugukunobolub.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/sopagiwugemujel.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/botusutopugisefopewaru.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/33404223021.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/kimivopa.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609c493a5b9d7---8543503708.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec1e42679---96986755164.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b19c90917a---xepomedafejevene.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/fasitibevoru.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/luzepopanabenozipiro.pdfIn PDF document text
    • https://campermagazine.tv/public/file/jozupesaral.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/nenewuzagelitamaf.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d669d34e6---nofivexesagenugigujejo.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/35353270647.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a9b4dc47a---xuguxod.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/93668593831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=company+corporation+assistant+syllabus+2017+pdf+downloadPDF 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_off0001667c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1667C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E93 11464 bytes
SHA-256: 8005304a3faf5dae6f27d8442ff1fc132c9d46cead31d82986cefea8b17b6069
font_02_sfnt_off000199a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199A2 18192 bytes
SHA-256: 92924d12ca8df4521a4a62f4ad083789b7e01e4a75a4ec6ea2b8ae83e49fd3ca

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