Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc92b76b4d3f2423…

MALICIOUS

PDF

48.0 KB Created: 2021-09-16 12:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83bd623909bb7b274170058f7537fbfd SHA-1: f131e41383e7ce01a77aee3997ad323b415b36c6 SHA-256: bc92b76b4d3f242362ea1ccab2b0c59fbd4f1a8d43c9c52fc6d387d36699d475
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

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 https://artofsurfing.com/preview/ckfinder/userfiles/files/fasotameta.pdf In PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/4065972049.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/rumowuparovoxew.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109041835085593.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210912_E900E7AF6017244B.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/nomumubudigubafotejijo.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/88318564034.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/71906750587.pdfIn PDF document text
    • http://ministerium.pt/files/94797301955.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c506198ac8fde15cfb2dce7c0394193c/dewamobikesozerepikejati.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae859f692---46811649483.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/84433094735.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/16592031178.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/tikosoditilekiwa.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/memodapakopefat.pdfIn PDF document text
    • https://gilbertems.com/videos/file/buwewulo.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/62810416999.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/62890083228.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614058f3201fd---fuwuwefozedixuw.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/xefomalu.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/55597956626.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/36112762790.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/notusofabuvinatudofawud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ios+screen+mirroring+to+fire+tv+stickPDF link annotation

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