Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8914a703cfa9450…

MALICIOUS

PDF

59.6 KB Created: 2021-10-03 08:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4556d7edf2560f31b9ff373972f7ee51 SHA-1: baa26439189856ae8702255235b2a2dd3dcaef17 SHA-256: d8914a703cfa9450301ea75e6200927b9a0a16cc980bd6806f8efbfc8d0d9a6a
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to domains that are either compromised or disposable. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8037

Heuristics 5

  • 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
  • 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://dealershop.es/userfiles/file/wevonedevikafekodomezida.pdf In PDF document text
    • http://hieuchuan.com/upload/files/xuwogeporipepupesubiz.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146f894c5026---44164947757.pdfIn PDF document text
    • https://yellowstonewildlife.com/limevedegiduse.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/17516910948.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/62072897742.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/63732169230.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/gimominer.pdfIn PDF document text
    • http://lejonhund.com/upload/17344185892.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133755387e34---peziluzipofamejojoje.pdfIn PDF document text
    • http://novafish.it/userfiles/files/52001920074.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/28242428267.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/39412156946.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210922212511.pdfIn PDF document text
    • https://parfumzone.ro/files/file/24658488618.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/repapafereja.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/44505030982.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/52883300626.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/lupofud.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/memujululuruz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6430b3aa78f4513bf3b891e05170124a/wewojonopawabozosagenole.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/fatirizuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=outbreak+perfected+floor+puzzlePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 10664 bytes
SHA-256: 68a0def7d0f64988faa7100667b351dbbd51385b299970bdb083d900688ef337

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