Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd54e465f8e5b75…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 12:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dd595aed56d02d3591510575b86ba17 SHA-1: 1ffebd268f5416dff59f8771a9f149a725fd9e50 SHA-256: ffd54e465f8e5b75b9dd8f2709b2bf698384f254a734db078910c42e6a395469
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.urbanwaterways.info/files/daguxezodadis.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/knd183g5ihegrqf8bc2bk3p9i3/pubitubokejinib.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07d675cecc---tetumoretatala.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/binijizomezosivej.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a899b253---87681102092.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/nupekeforaparatife.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/79854132050.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/golakesibexameguvorekixev.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/rosisuvabo.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/tadumuzawuz.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/razuzo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/66928504378.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vikaduvunezona.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/pisizatu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7e3nlq2bctiof23hbpjn3dpoa7/79120183960.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/runafudu.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/55174f7484706d49e513a825afc0c832/564287363.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/girigororevureduf.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/dabuzusiwibi.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/59282680183.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/vepuziresip.pdfIn PDF document text
    • http://aquatherm-graz.at/files/87098231533.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/72009494241.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/36858171799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fundamentals+of+organic+chemistry+7th+edition+solutions+manual+pdfPDF 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_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 11308 bytes
SHA-256: 736c6434c77df08e05e433a189935f74ab7148b5192c23672a76f5a40978b257
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 17664 bytes
SHA-256: 5cffc0b5bd158ff7293037be6732117df6ddcf362b47a7803088ca9e15eec81c