Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1f8b8c7ce85eea…

MALICIOUS

PDF

43.3 KB Created: 2021-09-05 02:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7c9a5a483b05dc70c80c8cd3fa3f2134 SHA-1: 88bb6645a028c2ecb2e2b85a5f9251a0fe76a67e SHA-256: bf1f8b8c7ce85eea374ade48323cdbe99a0a910e03cd65ccbe761ac73f10033f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7749

Heuristics 7

  • 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 2 text block(s), carries a click-outward action, and is only 43 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a557423043291bd18bc516abaeb919d5/37990227731.pdf In PDF document text
    • https://sayurhijau.com/contents//files/gojedokapefinixinuw.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/21892008422.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/retuluduxonakumuzejat.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/o59bltkfr4pg5p3800nom68su2/72518410503.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/f081eb22d438ce0a21c14be84f1aca9c/lemovenixe.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/jaferexarajinafomijufe.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/xuxoxonulefogiluxa.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebceed1eeb---wegovufevutasuniked.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/53f91c40a80ccb4f78b060c93b1f3830/resalisizezekazukani.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a4ed1c305---50418464997.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c35a59ec---wusedufotifelajutozew.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/72684135683.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/09564d43fe5ebd3e68ea5642b0f21210/20175976992.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/kujari.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/jabuvabeperesozamulutes.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010322473165.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/zeguz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af5116f11---dipovupaj.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/88917229402.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/kozoxeru.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/ecfa1d3d70d36aa8e07d565f446e67f5/vesilufilod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=oyo+rooms+business+model+pdfPDF link annotation

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