Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ec81ac2b5034dd…

MALICIOUS

PDF

47.7 KB Created: 2021-10-02 22:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4038352c8010bf29bbb5f4c7ed71e05 SHA-1: 5c913b7fc5f05b7fdbc4d314deaafcb86578f2fa SHA-256: 13ec81ac2b5034ddc248204d0491a964cee2acf394f4c6f248c328eb3a4aaa36
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6441

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
  • 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 https://philabc.ru/uplcv?utm_term=data+and+computer+communications+by+william+stallings+9th+edition+pdf PDF link annotation
    • http://clinicaveterinariailmarzocco.it/userfiles/files/sifajupe.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/jasiwiw.pdfIn PDF document text
    • http://szm.hu/userfiles/file/talolup.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/66056145485.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/pelow.pdfIn PDF document text
    • http://finchamauto.com/pics/mamerige.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/35606570796.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/32180281602.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/bisixavato.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3ac9b6e724c56565d27beb401f56eb5a/59167970133.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xudusutidagedatosameg.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/xasifunasususolev.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/88109185760.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f786d9a74---geraxot.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/timixibufeparez.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/jivevojijerikosonoraf.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210911_68E581DFC13BC436.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/29244766143.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/55240789140.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/4431915073.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/xobezegovinobawuxi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161540da164a58---59775280818.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f8cf6f6913f68751e0bac43b40d44ae9/vujinutuver.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614392b07597c---jovezemejisupusatemupoka.pdfIn PDF document text
    • https://advik.net/userfiles/file/fodavexiv.pdfIn PDF document text

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