Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f41ce94fd73b801…

MALICIOUS

PDF

85.9 KB Created: 2021-10-25 05:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 11e5f1e19b92cc470e9fa95658e357fc SHA-1: 605045c27a59ad763df6053a311d559b54063f5e SHA-256: 8f41ce94fd73b8018235b1564038efde5868ac2d2305d058dce7a35bd62f6615
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cinebuzz.be/uploads/userfiles/files/kepemeximixaxevufik.pdf In PDF document text
    • http://videofilm-tv.ru/content/File/35655186332.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506c355af4b---labudif.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/72357637465.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/vugenumivalelepejeb.pdfIn PDF document text
    • https://dcimx.com/files/772296631.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/zifemunusefujuxagixobelow.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/58962883889.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615d0b9004bf0---pexalulujaz.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/jotizukadifenetakub.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/77727456650.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/rozize.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1f1ceef58---gijorajonelegesugazisizum.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/51890877064.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e6c5d6e2753cfbe46dc125696feac8ee/nuromenuxin.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613387ffa2f1d---33386663414.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/44124850343.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/patekixebadisuze.pdfIn PDF document text
    • https://wasael.com/userfiles/file/18553242143.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/vunevi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dac2999af3---27762324713.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/toxawefa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161627e8eea031---76517794308.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/85235628228.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=peterson%27s+basset+houndsPDF 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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 18632 bytes
SHA-256: 6d3a9b06628057a02779b20d6f2d398d79c8a750b40fb041ce0f16980ac1d7f8
font_01_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 10480 bytes
SHA-256: 618f9efcfcb6c544fa380ad5a2bcfdff4e6bd9a97f95d56c1d7a3d880b6f2b78
font_02_sfnt_off00013282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1