Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb1cbe9fd3cc578…

MALICIOUS

PDF

46.8 KB Created: 2021-09-06 04:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f7485a7b72841799ba465b7f3da84f SHA-1: c39a88fe3ed8bddb82da266d62490e8b5457a4b7 SHA-256: ecb1cbe9fd3cc57822ab172eae0cb7df321fed3dade8339ee5c1996e49312a51
174 Risk Score

Malware Insights

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

The PDF is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it's an image-based lure. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves tricking users into clicking a link that leads to a further malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9418

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 46 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3nr5bodgoejh82cse575mvmk60/23924253469.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/28623555423.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/60474736671.pdf
    • http://kondicionery-lobnya.ru/upload_picture/file/95773423816.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/taxikisanamewobodud.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/1657287123.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b72e044b44c52b422f795983cffa1220/susino.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b2f5e8bdace28c04f1e6304718e43385/batal.pdf
    • http://bestbuyfromindia.com/userfiles/file/nuvezupowe.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7fcb4ea69---vuderibipalod.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb78d4001---fopezavizu.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/42965891840.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f984b9446de483e4034e1a1a2864061b/36215007037.pdf
    • https://alianzatours.com/imagenes/file/11292062013.pdf
    • http://scottleddy.net/clients/862555/File/jizamiso.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607461dd276fc---9961008637.pdf
    • https://austarpharma.com/upload/files/godesi.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d893636ae---zugorowaxutebuzofesupako.pdf
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/mosiwiferugefekokim.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608310dd03a0b---demetuboxosuburux.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad1542e8f---35470585347.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/46db294c4a5b5d905d26fdfe10cb5bf8/lotivozavaxanunidebibete.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chicago+manual+of+style+bibliography+indent

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