Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1e28d5d304680b…

MALICIOUS

PDF

93.3 KB Created: 2021-09-02 14:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5b77e949eba1f044cc6f60b433963a4 SHA-1: 8889b2a5255e2c73ca272998cfbf982697fc435c SHA-256: cf1e28d5d304680bd75792ed18b835dcba14d7cee422ab897cc0f7bd127bae33
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3837

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b030754f073---80624624185.pdf In PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f62783950529a54c92028d5ce540d1ce/77805983446.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k5ikoohsj6be6ag2u2pc8ecbrs/79141388661.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3c4839aadadb148e643d76de1a8dac38/jetata.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/75513222873.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/minafodi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/45781156974.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0aa65ada---71374101793.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///36461707.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/domusidorul.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611b64eccbf91---pibuvivobuk.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/51467708179.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/5686994205.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/berijowufinakitagibidivub.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/445a732amulgq6me3l03i856k4/jujapunoki.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/667259261d1aec99a85e3700a96ef7e0/37894847436.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/88701282862.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fvuc9jvn4p4lgvv7p4jna0u905/xubibovep.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/lezubupasikenital.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/69376199569.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021891324324364.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160743dabf3726---62523492601.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/6836638285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=patterns+and+inductive+reasoning+worksheet+answersPDF link annotation

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