Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77e3c4433c3790e…

MALICIOUS

PDF

67.9 KB Created: 2021-08-18 12:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76eae7fdde72d3c16818c4ef8a8bf270 SHA-1: ff53dc062374c6b8616c0c65739a13653fbfafd0 SHA-256: f77e3c4433c3790ef4039e3f513c964503fee1aeff8b937afbf803d860c1ff9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. No scripts were extracted, but the link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9583

Heuristics 5

  • 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.
  • 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://antoniolescio.net/userfiles/files/jidobulasagilofatew.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cq2rfo8plbq97ha2r2pua8v8dj/fimemu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f724075177---15971373398.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96cac7f4e---82634964650.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/50302410331.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/jujorisevaririm.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/2282969605.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4ac173de82ae76673c5120b8dabbf3e8/26006629061.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/favokirisapovarumekegi.pdfIn PDF document text
    • http://nenorm.com/files/files/fepubejexoligerubalanu.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/rifasudovotiruxumin.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/bd31fcbdcfd4fc82558860263e943ec3/99828426740.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/g2f2beuoc36idhc9biosulg9fp/dugurawenipex.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fb9a197b64dd99baa9c7913e7cf9b89e/74747521377.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/97610524722.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/813ee688fe266b31d44a5fbc7a182198/rudatudakufokizora.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdc9e05c6---nunogilafawakufemekef.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/99f8cd92dbe7b309d4d93749b791d3a6/4416077400.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/18b0c431a0ab81ec2b2b009505421e68/52019808155.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737ec89c93d---pizogoxelivuxowejiwek.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/fogaluni.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/22/file/96996514110.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/paxete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=conditional+probability+distribution+example+problems+and+solutionsPDF link annotation

Related samples 8

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