Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f66efeb93e52090…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 03:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abbeeae751a08c29b89a0815d3054a36 SHA-1: d375420e6db3a3ed125bfb0f470186bc6e17e8b4 SHA-256: 8f66efeb93e52090a018cff58bd0949f0844c627f9d42ba775660b6a37b8ad74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/86514857294.pdf In PDF document text
    • https://lesfeesdelhetre.fr/upload/files/90696802741.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/42476401745.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/vomenefazojuzodepize.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2c284817---63753862577.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/28817112793.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/81125677160.pdfIn PDF document text
    • https://artenika.pl/fck/file/vivejaxo.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/bimebuxobonipekikugolifa.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fh7ob06rnsads94djvej7g2lqo/kirosijakatexunemu.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/gosibun.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9d3868ef---jadeve.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fead1d543---zidirafuxazigiditevun.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/66306687732c977c1fe1486c4a9be219/82215709214.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ce1f61ec14950805a7843035a875cd9e/bimixunenurupebunipogokom.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/34506731825.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071caca27117---fobipelosuxogo.pdfIn PDF document text
    • http://wami.cc/data/files/98779346001.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b555e5cadd8---pabomisemefon.pdfIn PDF document text
    • https://digireg.cn/upload/64420562604.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/biwuwi.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/37204047555.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/vimasuge.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zujabanefipojemubo.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/64623406363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=maria+montessori+metodo+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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 21548 bytes
SHA-256: c7b6759ba0ae67cd9b68a553ad8262a45b386d0c6598cd25850dc27a406fb2ad
font_02_sfnt_off000134c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C2 10604 bytes
SHA-256: 5181926be631f5795c1912a233a6db3cd80e65adca356ff7e6f5a090b8cd567b