Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28fd13ef93c8833…

MALICIOUS

PDF

96.0 KB Created: 2021-09-06 16:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31e61f760c350256a1db3a7815ea5deb SHA-1: 872488b743862e88edbee58248ef67b29c6d0502 SHA-256: f28fd13ef93c88337f246b334f6774c588432000a40dcfb244edcc9df721ed02
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This structure suggests an attempt to distribute malicious content or conduct phishing by luring users to click on these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3333

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://crewmak.ru/uplcv?utm_term=the+cherry+tree+by+ruskin+bond+pdf+download PDF link annotation
    • http://latexindia.com/userfiles/file/jezalekusugoro.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210824_FA6A9FE8462473BB.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc3692508---18164412001.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/35096647181.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vn2i2pi51vnjh211ugca9lb7s5/87636462608.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/denekeva.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/suxumipozoxozosobej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6eb1a5f5f---zusibawisolofumami.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf679e27dc---61274229396.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2495dd3863---vokisibe.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/62055215137.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d867ff002f0---nodebekugulofosop.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9ssosl5kq15pnqek0u90pa6rj3/toxatisizon.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/312035ba3c7d52d99f4ec3381663e061/96286373796.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/db0557e74c4bb07a3e4b39d583a2e2aa/93993416130.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/11782349484.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/78535610341.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/22797465831.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/towufawowize.pdfIn PDF document text
    • http://mosjob.ru/images/file/85932794448.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ea2c5d3c118a0f16709e75f0fc914fe3/71696996488.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/figirim.pdfIn PDF document text
    • 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_off00012969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 19520 bytes
SHA-256: f45c79d0b0b7d5c6e684171921c24d0c9716de981893f3886ff398c7bb89d5c6
font_01_sfnt_off00015c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C86 11212 bytes
SHA-256: df977773ac9205f281da3e1f3c5de639c7ec097e740fa5be2e078a1fc0a5f3e9

Open this report in the interactive analyzer, or submit your own file for analysis.