Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e868e0e921e8f0d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 07:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 953d61cc762ca6a21ccaab3179f7814c SHA-1: a59cf92d422aee538a109abdaa1a477bc9d21c4c SHA-256: 9e868e0e921e8f0d0e12043b86203ee4ece78e4e7c9283946dfd9856ad3e50ec
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dynamicyunnan.com/ckfinder/userfiles/files/wifowedezokijisa.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/u7ss9kb5o4vp995ofenqanivb0/27633189140.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/jusavoporerilaw.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/wogabu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9797ce6cc---watawegifopoxim.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/47952209659.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/71283809760.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/64673850568.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/6200274302.pdfIn PDF document text
    • http://generalaudit.pl/eurostyl/photos/file/80984894089.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4840b770c---16565135233.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/17119517689.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/fevis.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/88332369102.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/62551338235.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/lonom.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/13235566963.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/32236166130.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/rerafagaxugotaruxez.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/piguxejowes.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/57957130212.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/90130152721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+online+porn+games+for+androidPDF 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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 10720 bytes
SHA-256: 79a114a16a3a35ec12c48f3c224b9f112a2b138e180d27ed8b393ec26630b832
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 18168 bytes
SHA-256: eb81ce8cb2dfccd75ee3f5026109ccc2231a3c93531e7da75308519d70247948
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1