Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d04a20a1846b6f4…

MALICIOUS

PDF

54.6 KB Created: 2021-10-04 15:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b0a9fa9d0f8cb9b4ca9fb057aaf485a SHA-1: a1d7bac10c7bc17237f972a2493625f943861259 SHA-256: 2d04a20a1846b6f477facd3966e8bf2cad01fb0a6d3a804eb5ce85b23895df90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to other PDFs hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. The presence of numerous links to PDFs on compromised CMS upload directories suggests an attempt to disguise malicious content as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7284

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://mebel-moscow.com/content/xuploadimages/file/movedixasaf.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191621741881.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/3055131903.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/11163722463.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/kevegaguviri.pdfIn PDF document text
    • http://partnercable.hu/files/44074691833.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/15291036768.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16136261c599a4---28342232970.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/tukikefedefawezal.pdfIn PDF document text
    • http://miminku4.com/contents/files/nemesegi.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/18494949089.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210926_734A2A2E87F14777.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/2882300846.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/366e0fd72018528c2c04f7db424df2e4/59566305651.pdfIn PDF document text
    • https://ntc-container.com/upload/files/mukenoliwel.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613776eb70671---31320102299.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/pazulofup.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/xekutelediwutewejijoxop.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161325cfb00e8c---roluxe.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bovetemamozan.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/zuvifisubudukuwufaxa.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/mikoxamotato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+stop+sharp+pain+in+chest+when+breathingPDF link annotation

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