Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d726f2becfd5b77…

MALICIOUS

PDF

70.4 KB Created: 2021-09-12 07:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a53dbee6d80a597b870d4aa6b4633a9d SHA-1: 03fceb45c6056a553df5cbe0b98b0c3783d8d55c SHA-256: 3d726f2becfd5b779801186c319877db43bc9fa6d652ce017337e1fe660e390f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of external URIs and a link farm structure suggests an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5cfdb5c5a---77627915614.pdf In PDF document text
    • http://canyonmeadows.org/userimages/palumagidubupanozij.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/34438573.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/99119161051.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/77985540953.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/jazegezutokegewodonobad.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613879ecc37fd---pojugekiki.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/sebomagebabaje.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/sorefijopefusanaxuxu.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/58992385376.pdfIn PDF document text
    • https://capecoralliving.com/media/file/52274166625.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/movasuzuduvukerulo.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/lotijukevuwejaf.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/en635k263dtoo539jtsghhtq3s/23339154022.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/fudanibusobivo.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/zatanifadubejesisukikes.pdfIn PDF document text
    • http://freestyler.cz/img/file/79472503736.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328e32e099b---pojuputebewuvozawo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/15090791645.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/30826360756.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/40376543795.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/rotidezipexulopaxugejosox.pdfIn PDF document text
    • https://majubesar.com/contents/files/83169421683.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/77001823441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=unlimited+money+game+androidPDF 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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 10544 bytes
SHA-256: a255db4e36f3714f2abc439af8419fecf64c61a57b3c0ef1e5832e65f4343b69
font_01_sfnt_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 15576 bytes
SHA-256: 08fee668ba0c089681f2a027d13256eaf66e75fe5af1c9b94629462687ad7e83
font_02_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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