Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e76837e47b110b1…

MALICIOUS

PDF

87.7 KB Created: 2021-06-23 02:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 91345620124acb4919d66164a7c8d66a SHA-1: ff23db6d4082f19d4367c4aa09d5014fd8b1db9f SHA-256: 4e76837e47b110b1e2f2b8c5fb5373d7853c159ad08d9ae99a7a2773517a887e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=halo+2+theme+guitar+tab PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e0c10a40---lotasijobonanozadelor.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/48586211047.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/kigekikekidafejemok.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c460c2f61---soteti.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xexotawufobokoxunenij.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/xonutibidupuborivir.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/36f94618c8291a23a313e7b201036182/zukekigobuvotab.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098f64cb6e3d---ruzuravoxu.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3b398d4e---nuvanupe.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a69857a76f0---71188186165.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095061ba259a---89814240332.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb3885be6---59751203602.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210615_AF55FBC57BB8ABD1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 3276 bytes
SHA-256: 15e27d28e478865c6cbdcc048c073f5c1fc1d7aa95689ce9764a70ab4f21a1cc
font_01_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 5156 bytes
SHA-256: 585064a7577ca3b27af37b01842266b2fb925220f5fe920940396b808906f715
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 15652 bytes
SHA-256: bba43e993360f8cad6f1be6cec92b2105fd801e104b33ea876866db4301c4239

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