Malicious PDF — malware analysis report

Static analysis result for SHA-256 29db7a5594dcf590…

MALICIOUS

PDF

98.4 KB Created: 2021-07-05 19:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e6fd9995398c2a567ee32855d1a8f5e SHA-1: ad9f69a8692ce2fba39720a7feaba80d35ad9a7e SHA-256: 29db7a5594dcf590058bd4c699ba0abc6e77a14b0d9df75a3db4f8457df41867
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external URIs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 https://krisoc.ru/uplcv?utm_term=marlin+apartments+limehouse PDF link annotation
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/icmggt8btl31s0rp741qdrelkf/58931873989.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/90792836172.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da239a4853---36613672176.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4013bd93ca6e6f104177b846f06f0fc8/kafakajajorev.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ab1e57e11bf339f8f53526858757c986/87480232043.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f116a5dc17---50357193568.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608522f37d233---78135237609.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/diwutijariwesimeri.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/44574535550.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vuzute.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/17164961009.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/jodakukagoliruradimew.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/36399082089.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/dopifuvafotawofavelasegoz.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8004f9bc151a710da7a3917e07b1296a/fisoxememuzamuzobep.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5ni5jgjvhj8shrcidjol49ucb3/62981350130.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e748548837---78630937064.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/fudekipusudewejovar.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1ad69aba9174ed0a57a6bc0c260dd8ef/xigosumudepudejapat.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3dee4002---tanexaxoduwinazage.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e48fef292---mepujeri.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72fc8e165.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7619578677---vuriwonevofasejipon.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lq36tkfj3lu6iu3gsts6nlss03/82388775167.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/gufozixorewifewuraki.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 10612 bytes
SHA-256: ca6bdccb638bb71b7d81aa176d35042121f5e28c288cac0b9ccaaf928e085889
font_01_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 16780 bytes
SHA-256: b1d82d114205a7fc2774f099f9ddeda03afc4db98e7dbac8d1ac5b17f2426d61
font_02_sfnt_off00014dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD1 16188 bytes
SHA-256: 43aaf6b7257293a9fb3df01e9826f837cf2b9b92f506adc28ae8aac51b7d6941
font_03_sfnt_off0001637e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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