Malicious PDF — malware analysis report

Static analysis result for SHA-256 5192aa73ff2ea3ff…

MALICIOUS

PDF

42.8 KB Created: 2021-09-18 10:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb6785ee3adb5ef745f7ab4efc0fcbbd SHA-1: c351dbee2064b4cc4eb52a72e7e120a939cf96c6 SHA-256: 5192aa73ff2ea3ff88ae1ed1114a5335d91a47ac9360b1b640e234b9317dfe00
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains a large number of external links, many pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be a screenshot lure, typical for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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 42 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://infrive.ru/uplcv?utm_term=okhttp3+proguard+rules PDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/42f615494873b5123530f7b914bb1218/64537654170.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/16201741160.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/92066177599.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7ee8ae528---teronebosigunepa.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/tozorifosobo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f70e7c91a---lupobegamizisebixuvito.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-17/20210917142920597742.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/14025922534.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3b2ca7a8---merivilowifegimixakamomes.pdfIn PDF document text
    • http://vhz.cz/user-files/rifizewokexem.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/51213197285.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/67415283541.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/kezer.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613498ed9b288---godofibugulab.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/66697727114.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/99648068489.pdfIn PDF document text
    • http://17njl.com/userfiles/files/36154464656.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/32413305193.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/19755185344.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/34903867798.pdfIn PDF document text
    • http://elskenecologie.nl/files/kenaromulux.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/537242554.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/fufekagorazedizudakunet.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/10523884743.pdfIn PDF document text

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