Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ae352dc400ea57…

MALICIOUS

PDF

63.8 KB Created: 2021-09-03 21:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6a512e6f1559004be23ed90705df3294 SHA-1: 2bb8647518c8cf331893cd432890af17457348c8 SHA-256: 77ae352dc400ea57e450b7d196c445e43aa49e1f03435557fd4d24a5855a241e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6241

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://librojuridico.com/aym_images/files/xupudozuxuvorulopenuxev.pdf In PDF document text
    • http://status.cz/UserFiles/File/85879425683.pdfIn PDF document text
    • http://chinalabware.ru/d/files/16573941017.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/mizabosenejununibut.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8bf6521816819a34613e9818efa89dfd/70703276644.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986cd060be8---jinoviw.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607652fde8fbf---nabiwolozudasilidejenu.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/86732060793.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/fusalusizixenerun.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/miwerapus.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074adc2134ed---33843654443.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/wuwifutudizuzip.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/46690676027.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612950739e326---32151301256.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99ef73024---7057266489.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/17954359903.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/puteji.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/24749394431.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/14/file/20210714_004119_189.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adc421c55b9---jilek.pdfIn PDF document text
    • https://highrise.pl/file/74616641099.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b336935bb5e5552b48bf9af8a0433da8/75481828759.pdfIn PDF document text
    • http://royalgroup.at/tmp/vupaxomozawojamubudodanim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cpt+codes+list+free+download+pdfPDF link annotation

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