Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e78cd4492dc05d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 08:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aafa6d40583091be1f48ab0a844bb35d SHA-1: 1d1c3b544f29e41492736d1f6e6a14687ce667b2 SHA-256: 54e78cd4492dc05d4e901be987d80eb98aaa39b77828a0ca4f0c3d4456e2cde7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute traffic or potentially host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nurea.se/currency/userfiles/file/fadibinafifamamowubo.pdf In PDF document text
    • https://dusunceokulu.net/resimler/files/97764990646.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a7a246c6---xowemasutejalalakewodusam.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/5321907912.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/rakaxewitepojudagaw.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/38863150845.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ab70ea1cee0bd2318f558eeda8c72b0d/84216806048.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/67714963128.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/1905554434.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090968d22ccf---71564226394.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5d87e748407183efc7f501d87f63ab87/vonuzetuz.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/262e34a13cf23674b00a5c89258f4c6e/73102230129.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/masewomuzom.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/lironugixereninoda.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/83462504069.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/26369421579.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fafemunebobaner.pdfIn PDF document text
    • http://kyea.org/imageuploads/78799919760.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160790bd72b003---kefifokoxebidejixevowe.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0ad2da174f92396e8af2c6601ea225a/75090088532.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/24359695355.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rutowekupixufogofel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=side+effects+after+spinal+anesthesiaPDF 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_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 10672 bytes
SHA-256: 15d7fa9a218b619b03a2fa749a8c06934c380db107772c626c8e38abefcea6a8
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 18100 bytes
SHA-256: 657ca7b1cfc6ff978dfd230af367a1b3cc2f899b8afbbf5e9e9466a51aafb2fd

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