Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac679431f67e80c…

MALICIOUS

PDF

73.5 KB Created: 2021-08-04 19:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0638d633745e7a213834edc8d857ea2 SHA-1: 682f3f7c48a25877cad615703eaf1891276b7592 SHA-256: 2ac679431f67e80c7cf7d1c8e8bd652dfe9720a12d6a22bed9e388401bb80078
162 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7065

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ca4a58067---93644607615.pdf In PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/33403935578.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210526112259.pdfIn PDF document text
    • http://tele-video.ru/upload/files/8848714333.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/famesim.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/83723019110.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vomis.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hkucrtem46l9hdtsllhu6fa33j/fosojegirofogexano.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/sefarutomil.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/25944344453.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/52671204865.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87350709392.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7a58ffae---87256370221.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/muwubilupopije.pdfIn PDF document text
    • http://landia-print.com/pdir/file/pafin.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8e64f6b8---83215300272.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3098fc77---63806762083.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6cea9d0c70d4ca0238c6e16c5d1925b1/26357175408.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/18457749040.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad196efaf---31886950002.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/negar.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jowujafupuveke.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/89400454420.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b1cf7e270652d6b84687c86b3745a7fa/3506201044.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/kolejalizati.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/48711494232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=patanjali+ias+philosophy+notes+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 10740 bytes
SHA-256: af49ce3db9926eb38e5d4bd476d541318298b78e5142d3ee1db5a55a29bfeb41