Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6b3aab656562c1…

MALICIOUS

PDF

80.0 KB Created: 2021-07-21 10:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6490a9931f982f8ed02dea012468d8fe SHA-1: bbff088658a6471c380fcccf78b6bfd5865af02d SHA-256: 4e6b3aab656562c1c6abfbbb4b96e30c3c586bf49baeefbf9039bdefc619cd90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are sufficient evidence of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5415

Heuristics 5

  • 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
  • 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://agrilaui.com/userfiles/file/527684509.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t6173p9neh68siagvlabcc5d66/bifadodepitimopanawavap.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210716_187A22B47372722A.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b3399ca0---vasuka.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a603f06b893---fetonowuriworuva.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713ee5af527---76752972813.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f63f9e851a1644546eab29b445a953f9/73089997022.pdfIn PDF document text
    • http://becucci.it/userfiles/files/pexazidoxakekitujapuvo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/55177143334.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/48099357576.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2add8a9c6c---87897371057.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/79210696222.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5efa34d85---nedugelupatidugidez.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3985c71dac---bulibesulasumi.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6090be101ff0b7a3f4afd7c4f315b5e0/12609877603.pdfIn PDF document text
    • http://hasyo.net/files/file/19268552293.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/52449837558.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840af93a80e---koxapoxatozerodasenaguwav.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1c0fe360b562c9e5b3dec642d4ad6545/58161427686.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/80423147226.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9054aac6e---zotudu.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/81099328896.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/rezorokemureragakevagemun.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/25101457895.pdfIn PDF document text
    • http://hzqzg.com/d/files/7712067939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bsc+entrance+exam+paperPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10432 bytes
SHA-256: 08141e4187fbb8fdea0d4ea3b4eef68775b0173fce077327aa337fd24e123aba
font_01_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 19124 bytes
SHA-256: 658280a444fae2beccf92ad0adf1ae0878190844025debfb4b604b9711e9d159