Malicious PDF — malware analysis report

Static analysis result for SHA-256 3949f0d8b8b59e05…

MALICIOUS

PDF

64.0 KB Created: 2021-07-08 04:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0f1bf8e436a0b4eaadf7652464922b69 SHA-1: 09b70cdb571a3d18e5ad7ccae4ca6427efcfe99d SHA-256: 3949f0d8b8b59e05fedf2f3649f358cf7b117e5e317dc9f74d10089041180df0
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7118

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://oniceh.ru/uplcv?utm_term=within+group+experimental+design PDF link annotation
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a87c0c46dcf---80458256163.pdfIn PDF document text
    • http://imaginove.eu/data/Files/35538025766.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/1f99af8ada6bd87031223d5f9e4c5dab/vosiwupukojokaduga.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf569cc539---nowoni.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/37764515988.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0603d5f867---dojobozipujomulofuv.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c514caa4993c13694a83eefd109f156d/33422672153.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45f8b60f0---85201394208.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/fibijifimo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dac1d7a575e---35818779164.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/vegodoki.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b120c7c76fd---2945646386.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gigelev.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae947b9cd---90596087246.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5c5a8480c256e3c5a7b54dc61174983/15538500190.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/28255243793.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d079877f4845789a3cb1693f823ac3ea/fetarosokunudonerigef.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/79907e491362c4af757c354cad848ef8/wujato.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c786c31f2b6bf355a830f2954a72dfc7/67381262.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a1e55f7b---refas.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/16973362475.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/6774744464.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbd5b9650---43089607136.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lefekifelopenamuje.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 11032 bytes
SHA-256: 2c35f1d1b2fd9fa6d1ab630d06bc95585d979421aa12593076fef6ff61cb97cf