Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe2626b86323f0d…

MALICIOUS

PDF

87.8 KB Created: 2021-08-05 06:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 286da7e7758790adc06e8ac272c3e433 SHA-1: cb364caba34fb1f09ba7de0e34257d43c8dd5bdf SHA-256: fbe2626b86323f0dc04df540bb1bdf449acf4b19ee8a07d484d0e0278f5e9f6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lure users to malicious content. The presence of a link farm on disposable hosting and compromised CMS uploads indicates a tactic to obscure the true destination and leverage potentially trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/2309982505.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4e32a72ec---90681723427.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210725_235250.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e3877bfcd3aef99fabf3910b0c6bb818/lozegigiwekig.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/4110821256.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ac75e7273bc1814b66700a3101d30c44/11909208917.pdfIn PDF document text
    • http://mp-journal.com/media/file/kotagede.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/mebazisafoliluke.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a101023c---danigugiwuxuvodij.pdfIn PDF document text
    • http://bakoca.hu/files/file/zegojozefugefuvibaxitake.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/mepuposozowipo.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/95617038957.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/52639204708.pdfIn PDF document text
    • http://belst.by/upload/file/35249771651.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a9e97faf98490986b01385ea2187675d/10762967369.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0631a1a370d075f168805887403457d9/fixodegagenikowijikij.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/40757950373.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/pobigoketewaxamomow.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/87344924514.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8b905df8c0df01c993c9e6eee62b7b0b/xubojogibawabaden.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609102706e98a---mosibojogax.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0aba94358f130f681fc7bb53d2e332e1/direfokobu.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/kizerurorigadalifab.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/54400163080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+add+filters+to+instagram+storyPDF 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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 10888 bytes
SHA-256: 8548d4585638178cb0fd0d9d17fd50da5d06f06dd9f21c1ba2e1df601857e607
font_02_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 16568 bytes
SHA-256: 5e0b5e3ec39b3b6d7188785b80be75b5ae905df12da0b3b1a00e5b8d2d66964a