Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97379610b5edc40…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 15:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 429f5a481859392bf7acfc0dcaac3e86 SHA-1: a5d957cf7a5c51d459a6458a67894cf63926a395 SHA-256: b97379610b5edc408891c08992243996235517d6c526ff3ff756e1eb3d397db1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that host further PDF files, likely serving as a distribution mechanism for malware or phishing content. The presence of multiple links to compromised CMS uploads and disposable hosting reinforces its role in a malicious distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://iskoruma.com/upload/ckfinder/files/sawirelatusarufurogig.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3ba765ab64bf289f299c443c59013ee0/kizabadadazebotigimerexe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131d89c8ba---jusikolifukesakolozabur.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/wemixuvupuvumisevil.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/vewive.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109120728052215.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fc512f3b---55840830360.pdfIn PDF document text
    • http://robbes.nl/media/files/57694011447.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/47845852164.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109082326239557.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/92703018483.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/tuwadobutiwe.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/408c884e9cc0c3a2dbe951f2114d9217/62924147585.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/65565692630.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///luzovapoveligudiwivax.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jaguwekiwixoliburatof.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kogeziwegupaxurinukivi.pdfIn PDF document text
    • http://runo34.ru/attachments/file/sofagutaputo.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/76152969989.pdfIn PDF document text
    • http://sinners-party.de/media/file/bofapatet.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/383174998.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/23997640386.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/70475005614.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/3254899647.pdfIn PDF document text
    • http://bdsductri.com/upload/files/wigukenuvuworijamex.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/7080681011.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/57708999793.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0a6c0d6a---masagewivururatagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+draw+a+cityPDF link annotation
    • 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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 17132 bytes
SHA-256: 062630ea4ff93a0ba2f0cddd72cf60240124b862e19784b9fdaf3f1df36fb4d1
font_02_sfnt_off0001277a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277A 10104 bytes
SHA-256: 1d2dd4f33ee474e38aebdc30aee8299ffebeca5b077c65c75346e76352426982

Open this report in the interactive analyzer, or submit your own file for analysis.