Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d16bcd3db171cfb…

MALICIOUS

PDF

48.9 KB Created: 2021-09-22 23:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bb349d9a9ec6cae4fa9c7d5c886fba2 SHA-1: 87acd365fbd4e9d8fcca8079574b2dbd7192d39c SHA-256: 9d16bcd3db171cfb55250b2b6b3af1cd7aa6b1b9d178d734ef876cdd9683ff30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier flagging suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6377

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://inwebjor.ru/uplcv?utm_term=sex+offline+games+for+android PDF link annotation
    • http://18554080.com/userfiles/file/lajekajememagin.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/bomobivifabexuxibomemew.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/potep.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/95957850361.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/52146387323.pdfIn PDF document text
    • http://8njl.com/userfiles/files/20803380546.pdfIn PDF document text
    • http://susutour.com/userfile/file/7747303336.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/73064538159.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eb1ce83f2---55689931379.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/13775631144.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/49375247985.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/94537969174.pdfIn PDF document text
    • http://chenruichem.com/upload/files/nokam.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xafubifo.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/xidizobemumojox.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/51402793907.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/tuxixigifedinodig.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/lisuxawiworodigebuwip.pdfIn PDF document text
    • http://riviera.az/userfiles/file/nifutulo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9fb943904---rosigaxozebemodevotep.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/34313448601.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/18259745457.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/pokafuj.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/87220988968.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7tap0voubhjort4nbe52k17el1/67386049402.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/dafogexaranom.pdfIn PDF document text

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