Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6e6dbf11b489eb…

MALICIOUS

PDF

61.6 KB Created: 2021-09-16 13:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c91ba577f7ae122df937f03355c3c14 SHA-1: 10bd3cf9989f1ab3744717f0a9ed431b33f9495d SHA-256: eb6e6dbf11b489eb79da71eb57db634165e91fd6ffa05006d11daadc294a5e58
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8041

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea06e8e24---gujisegudexekelisadiju.pdf In PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/56836711693.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/gunamup.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78f04f3fd---genuxofelisisa.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/gunefen.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/67598690249.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45771934110.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/8065183571.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/64688900923.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/dilitatojukat.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/kokusos.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c4da6746---vumukixi.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tavopebirukobamu.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/pababumosogusizopazap.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/xifagukobeji.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/58690576975.pdfIn PDF document text
    • https://granitnet.hu/editor_up/sameveziv.pdfIn PDF document text
    • http://groupkaishan.com/d/files/2548761191.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/91274060375.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ladoxorekuxubimuzedu.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/vevolaloguxap.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/migiwugenuzuvenuv.pdfIn PDF document text
    • http://bulmarconsult.com/files/senudexiwetabedotelo.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/mepususo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lego+ninjago+rebooted+apkPDF 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_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 18112 bytes
SHA-256: 533d5f9126ee7a72b4972487cb129e656b50725caa9bffcabe107e111477b570

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