Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db420f057c34f74…

MALICIOUS

PDF

63.8 KB Created: 2021-09-05 14:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9852d03ef59a993c2f2fe720e5407cea SHA-1: 363e8fbc498b8f23fee8c47ad291fc0933d8a07b SHA-256: 3db420f057c34f74603da11aa13bca91227bb1afcb9c59be3faa7de9dab5511c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous external URIs pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The structure suggests it's designed to exploit SEO vulnerabilities to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6321

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://krisoc.ru/uplcv?utm_term=list+all+kali+linux+commands+with+examples+pdf+download PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7b4bd0ae20ed7708a8c459a486d8bb00/1968719771.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/21952635443.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3cf8fc33448b7a84066c8c9ad60e45f1/34096460849.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/33754488385.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/65103631730.pdfIn PDF document text
    • http://tano-cable.com/d/files/50455204131.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/eb2af8ae0f10e308ab35957b8fcedc42/rosaxixinavurov.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/22421155676.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/38927675186.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba9ad1f14---65673286321.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105140958107409.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/mabijeropoxujenufomadixuk.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/73906ea29b95b0372f65687d8768e698/jepudowanatanukajusugijul.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/4965501637.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/puxowuxexewexuvib.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/maxek.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be0d2cdc75b---11020688912.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/waxenupilok.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ed51449d0---lipipe.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pi33buq4j82b66pv5uhbt7atj5/wujixararimemotimufofizi.pdfIn PDF document text
    • https://abeess.com/userfiles/file/13973274229.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fefuvulojupara.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/98576881036.pdfIn PDF document text
    • https://drlanda.hu/user/file/motagedegasilovaxetizup.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5372635c8c3a55795c245ac2529e4b64/sijirilolenolugig.pdfIn PDF document text

Related samples 8

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