Malicious PDF — malware analysis report

Static analysis result for SHA-256 794b6341f5e168c1…

MALICIOUS

PDF

164.5 KB Created: 2021-09-08 01:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b1423a5f62844f1c9f87f4ef113f63c SHA-1: c3cce99bb7109035f5fedc4f6c9f70a3a80857d8 SHA-256: 794b6341f5e168c170a6e36201eec87601d1aa47b2b8ec9460a8ba19d85f9460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://doctornhospital.com/banglanews24/editorsfiles/files/28617837108.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/trtbu4j9dnufds8qb3022hno0r/ponokodudejarepasubaliso.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a76ae4033---22825727210.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/uu84s58sc8mjnc3606as6q76s4/falewalasatexupezivijanat.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/webeteropemiv.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/fuveguguvubek.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/31975058100.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/54491301564.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/duwarududuzabusadoxabaz.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jikofisor.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee67857d3---mazerulasowexepa.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/walanagizomelewusamaru.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/39373700665.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/70528933270.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/37900475171.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nafuzeni.pdfIn PDF document text
    • https://webmenuplus.com/images/file/18431362680.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57be2dac5d---liduluvovos.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834de38531e---37087910820.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a1e8017325633fd3fe62db70b7d45ba4/41668136595.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jotemel.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vofafururajofereridis.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0c82b8b96999cc250393565a1d7b6c62/gegizipugi.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/61667668019.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/98508283257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pharmaceutics+the+science+of+dosage+form+design+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_off00021e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23635 11120 bytes
SHA-256: c744f1274fbeafb2016757c8e100133a5cae7834a924aac3c2b2b9be45588059
font_02_sfnt_off00024fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FC7 19804 bytes
SHA-256: 1e95e603ff9ec23770680c73808ed1243865b827d19fe6d8d87ce83f8b77a747

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