Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff50745a3b0b93a8…

MALICIOUS

PDF

48.0 KB Created: 2021-09-16 05:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f0783e3b4e31fbf5d4682cb7d55e27f SHA-1: ea49eeb03b8f240642faff70b65d4bedf04f528b SHA-256: ff50745a3b0b93a86e33cd4d78612f48747badcc4342d8632db431b5995aae01
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple external URIs, including a link farm hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7126

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://huntic.ru/uplcv?utm_term=the+certified+six+sigma+yellow+belt+handbook+free PDF link annotation
    • http://mundori.com/js/ckfinder/userfiles/files/95782684544.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/suwojeluwepajur.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/61361980304.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/pifekipixe.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210910062737671.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109022303233591.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/41381949598.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/49768230559.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kalisitigunimufujo.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/jifopazanexomidedawora.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/fuluwewe.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/55730056411.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/zikujoverejevixifesuru.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/74651846514.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/mirotajivozutan.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/fce5669382608e8bff9e46f11a86afbf/71400590437.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/37692534563.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/71f6c12d5afbcfc18e7b34d2c1049c79/31246540741.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/47530479fb08628026fed87866699427/bimurofedarefenonam.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/bitisunaw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614016b675a0a---vufanitosugakobem.pdfIn PDF document text

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