Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b259500c8f234a…

MALICIOUS

PDF

109.2 KB Created: 2021-09-07 12:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c118c14f15be75e09fbe45985309b013 SHA-1: 8f04205cd7237ad80fdfa081351cdfff7ff2d486 SHA-256: 46b259500c8f234ad3ca94ca3b50095548a5d900f4ffdc52125ed041461a0a8a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these external links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://krisoc.ru/uplcv?utm_term=hashimoto+izabella+wentz+pdf PDF link annotation
    • http://oshcongregation.com/userfiles/file/nideliratalajovupobizi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a5ce31912b572b8a4595b76c8743d600/wejozokis.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/mezekulupavevijugax.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/65081197226.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/wakofamazotenutatobujolid.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/13107870189.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609d911b8d6fe---91698630277.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b8451221---molaxijipanepikexa.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/xepofije.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0631aa8cb---newexoxobijebori.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095557c253bd---memavisagavawijola.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a3a755bdeb977bd86444ad13201c4e4/pabazitaduvefojukuzi.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/11232e1ab8043078cc400baef9541f30/11329205009.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/fabume.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/64892744742.pdfIn PDF document text
    • http://vitrine-prof.com/files/vosoru.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/456936dd8a5a4073c24b1d7e49e9c99f/25947591604.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc1a00a2e---juteruwadisekuvuzujakuzas.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/reniretiju.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/81571t0f49pgro9cofl6ghq8a7/13040603100.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ueqeaau8cn9ht8puvj6jltmpu/lodalujimumu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/vokib.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_off00014640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E52 18616 bytes
SHA-256: 3144b4394aefcb3d120812134e872419faef5e522f2816186235643c1d9cc88a
font_02_sfnt_off00018de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE7 10940 bytes
SHA-256: 48cdc688db0f85be1c75406d39912a7c437efeb1cef7fc94a8f23958f31a46a6

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