Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0606a0036925f1…

MALICIOUS

PDF

62.3 KB Created: 2021-08-08 22:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0099f35e8c52dddc4403d7f5261982b SHA-1: 9da6fe27fe2ce6ae8f6a224ca4554ac948053b08 SHA-256: 1c0606a0036925f19d32791877538c827ab6d321cdbe75e67a3e4f5a55b33da5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8633

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 https://irlanc.ru/uplcv?utm_term=histolog%C3%ADa+del+sistema+circulatorio+pdf PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0a743e2acdd0c1c2603ea8e95466ee2c/28673319624.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/95988435606.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5bb03d57ee53020242d6d7d4d35b5f3f/40320495142.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/49116293525.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/75171352723.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/74e257e8fdc1a52c7f4206c96f95be74/divurigezulule.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/2302280435.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/dovurulofel.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160885556c92d5---botufomozabegimivina.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1q05k661l3iecokdepstqc43p2/93069031542.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/kikosavepokax.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca8a0b53f---23183249556.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/75861894276.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/saxakis.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/pajapidosi.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/18780264014.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/92542379115.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/271qtr9dt7vojpumdi0qhf2mnb/mudugafin.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/91964442649.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f63a824b---kejeluzolowatomazewewa.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a177b5db445---73786335850.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a48af0e35b8da6934c3e592ab8af578c/52729647005.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070118d1d67a---zigemalutuxuwopem.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a2e22004e193e712eec7d741d481f40e/suzawofewimopiwowosirunik.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/32221642131.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/887ad2116ba7b9d7c8b229279d6c3f53/38498625649.pdfIn PDF document text

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