Malicious PDF — malware analysis report

Static analysis result for SHA-256 1500a5f4f45f210e…

MALICIOUS

PDF

73.3 KB Created: 2021-06-08 02:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: dd5b9bb57ce8054e977c010b97ae08f1 SHA-1: 35c111e1cd9120535eb7e8625e946425dc13e15d SHA-256: 1500a5f4f45f210e0ed33629c6a924ab4b1c8bdc2ae88c651fcd5e48bdd54d3e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=kane+chronicles+book+2+graphic+novel PDF link annotation
    • http://limoride.net/gallery/file/fifepozine.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/xipoja.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/pitusazexu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc96d3539---tuviwosi.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210507185634.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/43769984049.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160adab3877a31---74837401372.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac100a3b75---mutevimuwagosowiri.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddaab55c50---68410185297.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/69882569284.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2c2bd4d270e9690206057bdae982296e/pizuzemudewowe.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/d5969b2137237a7c56613d973f17377b/61490987138.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/los5a2tuar8rjr6j160epprvmb/wudanisedilubepawewagoxex.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1apa97evctlqk839ps3ulffuc6/72794853233.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/41206a843b45924a7fde737ea91cfbd3/medifut.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/09e98a2e32600ec649ac58e1d163fca6/wapexexu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 5560 bytes
SHA-256: 67f65c7c4eadd649f2df96e4cade558043effd58cbbc5326b13c3cd4c68831b1
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10796 bytes
SHA-256: 93c9ed8c13519e599e27a9e5f663fa863c4f6db18774ab27fa7e7621c6adf434