Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4849e50b1248cb9…

MALICIOUS

PDF

77.9 KB Created: 2021-07-24 22:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3b8b2eee8daafe090ddf3565496958e SHA-1: d0582fa0117e1296dfb36ccafb0ce7c030ee4a42 SHA-256: e4849e50b1248cb9f2498998d6847ba9881b45d778fcd943a9f0401559d22e5e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The file's structure and the presence of multiple external links indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/td3tdgu9eceohup68bja490u96/gidokadaradipemibejidizov.pdf In PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/saxogijinakesaxaluki.pdfIn PDF document text
    • http://rld-carbon.ru/file/17850267797.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/24469dde813068b446c58dbace79691b/1154975117.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803436a9d21---28357244816.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/43098228686.pdfIn PDF document text
    • http://soles2walk.cz/data/file/24978527647.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cc05ac2a---20132869447.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pekagenabaxixigafa.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9bfb48f7dcca8518fd6e6882ccb79261/37043006420.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/71777442246.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/62230012723.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/dafadubirelenekurar.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/12509910874.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/todewefidabonixowibal.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160767d008ea64---17273768022.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/82381fd5d806b9f62806e7e51f6e0860/pononavimilafiga.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/91e8468cdec4c7ad30920f62ac5153ee/81109681634.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///17111098170.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b4521b17712---diwunewaxag.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f663a2d5---73543603333.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aebf12304b---tiwadetuv.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/29731049149.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/74747403727.pdfIn PDF document text
    • http://net-marketing.hu/images/files/dewapaxuvejom.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/948fe8ad96f10d7688f7930299c6b76c/wokoki.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077cad2bdaa0---molelifofixaruwekexurok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=les+dieu+sont+tombes+sur+la+t%C3%AAte+film+complet+en+francais+3PDF 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_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 11308 bytes
SHA-256: dddbde96cc7173bf65c9ff512aceaa585762b7684b9d3dcd3422d6253aed47d2
font_02_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 17100 bytes
SHA-256: f4b9a325e220e4582634a65429a3e31829eb12f9ffdddd87d8e0512863837d75