Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c614e89ec350e5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 19:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9b9a75ed3c99eef6e84e56b7c0ec07f3 SHA-1: 7afcb3ee9e73dd7a06da50894a63d4584bafb9c9 SHA-256: 64c614e89ec350e59230c2b3402197eba862f197c7d4efacd79fbb155f6e4d0c
196 Risk Score

Malware Insights

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

The PDF document contains a lure for remote support tools, indicating a potential social engineering attack. It also includes numerous links to external PDF files hosted on various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm for distributing malicious content. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://jan-fotografie.nl/upload/files/94869133391.pdf In PDF document text
    • https://hgindustrial.eu/userfiles/files/2144440896.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eef3b46be9fe555607c0848a65ef0c07/89620739615.pdfIn PDF document text
    • http://suaups.net/userfiles/file/duvanubabiruvidebik.pdfIn PDF document text
    • https://thepainter.asia/upload/files/42618212373.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/nipixivomasinivoteba.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/mepuvisenusijofe.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0e2e547d---negerizarijuwuf.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/vogipugufup.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/lafis.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/lixusajalaz.pdfIn PDF document text
    • http://e-district.org/userfiles/file/fitelaferukex.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407e941ee0d---dowadunaxe.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/zirazamuwudam.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/15966573796.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/jobiso.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/65740025940.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/rudunanenejamun.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/degotukadujuxizoguxit.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/91629524205.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613418ef9c4d4---xiwisudikufumegil.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/poxidujakefaxuwe.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/fifud.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/menuzejanisuwuvinokiz.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/43927405208.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/devodexefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=avoir+tv+remote+appPDF 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_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 17576 bytes
SHA-256: 20a2edf49d548e96900de89386dcd23b58066d1b6a4a2d68729699dfabc9727d
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 10144 bytes
SHA-256: e9cd91354f3863946594d4598c37e4064da668de7db512454dd3dcd30740d04d
font_02_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1