Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cad277bc10ac03…

MALICIOUS

PDF

54.6 KB Created: 2021-09-17 02:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86522bac9cb4370853220cb7b6396418 SHA-1: 15ade87376af847ea0616bde4df40688c7f1a71e SHA-256: 66cad277bc10ac03926a62f5ce5d839204f3f4e9ef04df201792e41f5c1b0b6a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. ClamAV detection and ML classification further support its malicious nature, indicating it likely serves as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8456

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://www.agot.pl/upload/file/91306884458.pdf In PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/doginuvarikani.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67083358090.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d85f178e507a9a2af8269467a5950740/11590630549.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/75239386896.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/tugetetilasazojo.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/dexewezekelelonop.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/84631906238.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/32068911627.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/41041672586.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac0460cc0---98173581939.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/mopotaxuvodugoduxova.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/97550053451.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/96555550657.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/pagitasabekura.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/dalubabiju.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/695286a1fb771c8b8c69419f890bc11b/55078038936.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/fubemejo.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/70489798502.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/58542158366.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/kujovivoxezive.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/68000894834.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/59175089427.pdfIn PDF document text
    • http://kvrhousing.com/uploads/30170819937.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/73937535154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=carrom+disc+pool+android+1PDF link annotation

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