Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d5c0b3e58793e8…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 18:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ea958d01965a8c6ee01439d31bf35b8 SHA-1: 72d003bbb025eaac97f82ce4124c8809919e4f79 SHA-256: f3d5c0b3e58793e8ae3c3346f633c27f97d0d51729a1a7cece7e1b8f14f765b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a clear intent to redirect users to potentially harmful sites.

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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9e426e43---solulegafar.pdf In PDF document text
    • https://dbjadow.pl/attachments/file/33684041605.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vikelepuzexeluzi.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/xofonoxapowulewe.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/tizuvarexojeni.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160924f80e5838---8270664998.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/filode.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fdad0a8f---xudevij.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/36177331359.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/liduses.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5270519d09e0f5455ace6f1f930d6458/tovevutofivogoguf.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/62399040176.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7d36e9dc---katitatanololavuwipexiwud.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d68a4e42d---98474686357.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/jaxixokuwomor.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee56b58a850---kofilalemojaka.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/91712264600.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/tubijapeju.pdfIn PDF document text
    • https://cloud-tutors.com/wp-content/plugins/super-forms/uploads/php/files/f093d8ef5a8bdc5abef3dfff86f28436/62057750577.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/dcd19cc35c0a0dbf40e856589f038fab/58955306394.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/84682773180.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kuvifobuz.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/eos7afhan8ipispk01ag5kml65/29928944276.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6e8aa35b1a84eff065d08dedee6012f5/niluvun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=railway+medical+manual+volume+1PDF 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_off0000c07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07C 10628 bytes
SHA-256: 1c27375b6fb0da8cee7d3391d647abb3f9b76dfc5a7bc9181ea2e6a9d641c5aa
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 17228 bytes
SHA-256: ca5fcd9341570030280281f7b124e5190bb1583409c4367cc65a067488c0bab4
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1