Malicious PDF — malware analysis report

Static analysis result for SHA-256 049960f418bd73fc…

MALICIOUS

PDF

70.1 KB Created: 2021-06-11 05:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 50f6136c483a03069f90a0cc5048b66e SHA-1: 61c8c07c988aa61d29cdecb81346098302cebde8 SHA-256: 049960f418bd73fccd27a1269d15cada1675319bff9a8ce214986c634386a686
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document is classified as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous links, many hosted on compromised WordPress sites and disposable domains, designed to redirect users to download sites, such as one promising 'Gta 4 free download'. The heuristic firings indicate a link farm strategy, with a high ML score and ClamAV detection confirming its malicious nature. No scripts were extracted, but the embedded URLs and link farm structure strongly suggest the intent is to trick users into downloading and executing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=gta+4+free+download+full+version+for+windows+7 PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/26774846842.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/duposigepirafazosaziw.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/8acafefb4d8b5e3fdfd1e9f5f5ca7743/fejukodipizu.pdfIn PDF document text
    • http://hasyo.net/files/file/59010666890.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cmf1it84mb4udftqmii0do9cl7/10955231239.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/92810992310.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/zapevofivozonoxen.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/73461177915.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833485f0491---57531038532.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160acde6a553ae---72639666855.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/52637296278.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/bf8c36u897vg0k5a193nketp4o/73677551589.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d13c6eae---54861246545.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d235f3b3---warariwafik.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/td3tdgu9eceohup68bja490u96/gidokadaradipemibejidizov.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jivikatapenalufid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 5252 bytes
SHA-256: c06f5a3fac8a2c8ae230caf1de5f330d3d7f133db7682e949df329ca7e5b4b5f

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