Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a68cd62f3b98f0…

MALICIOUS

PDF

60.4 KB Created: 2021-06-23 09:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 91b58fd3c085d2e64d0f92400074799f SHA-1: affdf8c7592e1d1cb1f567c6b42457f11f24024d SHA-256: 11a68cd62f3b98f03d97b5b45f2df13dbf83dc0fcefb23f8500574dc3234218b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/uplcv?utm_term=moki+250+manual PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa75004578---mizisoxo.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/25163072689.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/jipukez.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0b310ea9---gefemopupora.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bokutuv.pdfIn PDF document text
    • http://babamoleskine.com/files/file/11360636795.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bitoa84agoqug9t6l83pnlp57/kitoleful.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/15728049979.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6a16a1bd---70279800931.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/2a20244b339985f308aab681b0df6bf1/91920486078.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b1913acd---tububebigotupifisulob.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/nmioktfvm4rh4p7oap5366193h/kotesewar.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b11d543b---63097048322.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/b4tuh1q64eiind1vk8e1gqb81l/wedubonuxofabiles.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9bc1564b6---fapezawegelesuv.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607925109ffe4---74919937078.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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 5024 bytes
SHA-256: 828f2097704d310282f5334ad30ae79a8dd835f7c55404406ceb8a0a38c31272
font_01_sfnt_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 9984 bytes
SHA-256: 653b541ce3420f7387547c8f5abf06199877e65f28e3aa317b9a085ff28360ab