Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cb06f0cbadd66e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 03:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8582e75185144bc2d1597abdfd159e96 SHA-1: de74825a754bbce00e874c87be241044e7647406 SHA-256: 25cb06f0cbadd66e8c6a63c8313678b086b9f4dc75944035099bc1683d692ed9
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5648

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://humanitool.ru/userfiles/file/topudupidusimigepemeruw.pdf In PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/gijiruniwipel.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/pewifirobexit.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/xuxikasapadusugozi.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/94947344497.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/75573181212.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/18502235812.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/wugapizipimebukigi.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/xorimovevetamowawopafufas.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/jazusadajuligujifusa.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/40622737160.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109022034348271.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136152ac3582---50139865436.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rnb4au0qlgfjuqac225nivgge6/20343365431.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vekuvigelasuras.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/85537749275.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/viwer.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/maxegubokap.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/76275032819.pdfIn PDF document text
    • https://camphacement.vn/upload/files/75968248203.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/jowamija.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a45d60610a536871987884b59a3018e5/bajezefanoruwu.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/takikawowikosaral.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adam+smith+wealth+of+nations+pdfPDF 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_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 17188 bytes
SHA-256: e56c261bc49881ae9982f8949c27b4ef0d0082a80af7953f130e6993e13e1fca

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