Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed8536917f95592…

MALICIOUS

PDF

63.7 KB Created: 2021-09-01 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9acb21e4ebad06f5680ae69ee7ecc2bc SHA-1: 00fb94d4e1d4e59328aacaa6096ea123191a5cc6 SHA-256: eed8536917f95592a20c45826432558bad4348d2a254da02e7af78a327384045
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/6aabbaf7f6e3dcaa2c3c4451f5bfc67d/jodulu.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///sixotexaza.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/wumifaziwageromupemobari.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7128c1a7e344d1427ca705743942b763/27653797907.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/66438236128.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1fb47e801---fojedagiku.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5d0f6816625569871893b2abff4c3997/14175859577.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7e0c4c22ca88dcd55a2101123db8c21d/88224335348.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/bupelojagabufe.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/37424230027.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/82911148659.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/takazak.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c8adce487bd46ab798f4e6992ec2993/zuserixum.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/75730843102.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b7e9c322---soxekuxuwakinuda.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/mupowezibu.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210703233719.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/69434128564.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/vexalelawina.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/89587433253.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/f64b8d6b5b2c37480e74cc2e35fade3c/takikadi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608512a44deff---fakek.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hgm7g4llfvk74gjhhjfdpl7n0b/minobikokisekijeronit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=brighton+fish+and+chipsPDF link annotation
    • 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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 10776 bytes
SHA-256: 1da614cccefb32296281ffb6734baf64167916e1ad45e019e0d1a7d259a9456c

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