Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7b3fd4ddd789b9…

MALICIOUS

PDF

97.5 KB Created: 2021-07-14 04:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7265080250d173ef50bf6604f03fb3b1 SHA-1: aa9070c309383e70e16db4c0d81e8d4737ed9703 SHA-256: 8b7b3fd4ddd789b98a0f9eddea749f1798cf2c568568b2745e808136ab6e09a1
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the intent to trick users into downloading malicious content, likely through the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=11th+cbse+history+book PDF link annotation
    • http://liqaa-lb.com/files/userfiles/files/8343821245.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906d1bd9660---15178990425.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/bituvekeniwix.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68cc2707b---54628011140.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0654495001620631571.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/velimogatawimoj.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/kefemikowiribip.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c998b587a---xovipojapewo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607163675fbfa---gerorimofexoda.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f08c558cf01854889260a1adc2461492/sobuboxixetituvezelusino.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/73801078278.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1g9oenbk4m4vf3g7p9qteqaua9/60228866600.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54861147bc---pufewaxevuten.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/7106425075.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081068c67bee---bimunuwojijavamajikexaxes.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-24/20210524025307922786.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3f140dcc8494015ef4ef92fced352ea8/73723617654.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/70809747198.pdfIn PDF document text
    • https://thepainter.asia/upload/files/81590916446.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9d63ce18---newetisiweridubo.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/dizusadibil.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/monibu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27e1dbf60---93960240761.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7e4c2e5d76b800f1bfe7823a8b5a55c0/57869638967.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 17288 bytes
SHA-256: 749e796c6ced1026ded011512c860d658e5a7693cf389a447de1a71aa81b443f
font_02_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 10316 bytes
SHA-256: 5374de4723efe1fbff07598cd539189b943d7675996a321e89036fe5a7b62ce6
font_03_sfnt_off00015823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15823 19488 bytes
SHA-256: fb604aa5d640667e9d4b316f1bcaaf9ae358d01d1a33a27dfd464bb9babcd993

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