Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b600ff2b99ee87…

MALICIOUS

PDF

84.4 KB Created: 2021-06-10 01:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c4422b97da6160b8fc840f9bbc5072e4 SHA-1: 491d108a55304bc477d4048fec55325393d0d94e SHA-256: e3b600ff2b99ee87197cc17cd127967aa2b5827378bf99eaf1a2b6a53e393f71
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of 'utm_term' parameters in some URLs indicates a potential phishing lure related to free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=satyanarayana+biochemistry+6th+edition+pdf+free+download PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2800bcd8d---suganamamedijikadowu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160805462714ed---89143137456.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6qo5p4b31qp2u2ako9v988e55k/netadase.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/374ccaceac5093a8ea94bfd3cd59b090/80421590340.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/63221652592.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c662ec86ae---xuwinatuforewemomujatugo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/kotenuwisobenajabewi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb0ef5e263305800acdf0b7819111bd3/14469252826.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/37fa77f1ae6e98bc0329a8399513e2a9/2367214879.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160766505e5240---98761294707.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834d71d888c---39741345413.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/87b0942cfd4e0b2971d75ebf63c77d90/rijizibusekuf.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b39755aee---remajunururavubupapabe.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/aroqfutqfasiubq5s9vn5km2g2/47867539945.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ia3d9oot11qmt9bnpgsnv2jt01/fovijevotinix.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/6p0sm9rftr75schu85e808vm4q/sanogitufox.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/7423396460.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 5776 bytes
SHA-256: f6d5e312012ecd1bfbfe0e1a5d759f94d8756d93c6bc1dacc1ae8a7f1c6bf3e1
font_01_sfnt_off00010f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 10820 bytes
SHA-256: 890b3f16cae012a1bc75420576e97735f743e9350ae9068406c236ba5fc59480
font_02_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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