Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f8b7093279a540…

MALICIOUS

PDF

85.9 KB Created: 2021-10-06 02:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b78e2dea410775fc5e33b38e7e5562d SHA-1: fba7849e427b090136e2e932e0b04ecefeee4cc2 SHA-256: c0f8b7093279a5405e6f27bde3dbadc1761fc4963a6a19ef67e79ed36b8198bf
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF is a link farm, with many embedded URLs pointing to potentially compromised websites. The primary attack pattern involves directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5884

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 https://oniceh.ru/uplcv?utm_term=culture+and+society+as+a+complex+whole+means+it+encompasses+the PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161466935722e5---90028876950.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/92411922185.pdfIn PDF document text
    • https://renteci.com/imagens/file/19979928455.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bebojawunoremub.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jamabaf.pdfIn PDF document text
    • http://allasclub.com/campannas/file/87809207494.pdfIn PDF document text
    • http://darec.sk/files/files/kedokevumobuxofov.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/jogogokufatu.pdfIn PDF document text
    • http://mdtrend.hu/files/file/87646501741.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/80670585903.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zasunep.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/52867657452.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/pikizobetuwumobabev.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0657ee757---zenenibidudadekisoxowid.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/60081206804.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/62082832450.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/72911803827.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158a9ff5f721---doxivadapo.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/xupupede.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/mokokilusamamemeximeti.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/ruziwivifurazixure.pdfIn 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_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 11212 bytes
SHA-256: 25ba0b48ec567c78bfe1b535dfc9a4abb9be8318e4a6f6aaf7f73b9c26ade4e5
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 18660 bytes
SHA-256: 0410795ce9730202ba8f6036b91bf267b41c8ef2d31a9638ea92339f67c0909e

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