Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7873a8a2b45997…

MALICIOUS

PDF

44.8 KB Created: 2021-09-12 12:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66cd951a84584a1c8c4931751bee71e1 SHA-1: 62bf5b96a4ed7e08fc51816a201bd838c04cecd6 SHA-256: 8a7873a8a2b4599756ed30894d584c1fa587d927c9b8832b7d42b3d3210bbd4f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8653

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://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/49473963352.pdf In PDF document text
    • https://novitas.ro/files/zoxofuralovenopogikes.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/netemomulumoza.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/94179317636.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sedowetorabikul.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3bfe1ccd6---81667530518.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/zidabajafijajurixutiw.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/tijonemediwisoleru.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/paladotokokujefa.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/tawisopajudirovamef.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/74633632214.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/miwuniwibiroxiva.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/80420632947.pdfIn PDF document text
    • https://negaratoto.com/contents/files/pixerawanege.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ajpto12enn4l2aklpc49f35p8e/zokudur.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/59990392131.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wivufuduvurasilomasaziw.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qt90tnnf2qc0o78nkbf0lntr6q/wekuxilexinozofogoni.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/nipawojuguwelezaxos.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6861c24a07a721c3d4e205e85d162c3e/nibepusudebutuj.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210912_ADE9F7AA45DE945C.pdfIn PDF document text
    • https://lensprovIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=onedrive+live+sign+inPDF link annotation

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