Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb25253ba4cadbf…

MALICIOUS

PDF

64.0 KB Created: 2021-08-10 01:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e468c87d58200fd214c2ddec9cdd840 SHA-1: e64079a662abe6eb890c6266a51200e135ff01e6 SHA-256: ffb25253ba4cadbf9476c0eed9bd99f7078a7033d2dc9a7e72e3840676c2e7c6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9542

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 https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1f1e1f8a---45931345612.pdf
    • http://docando.es/js/ckfinder/userfiles/files/vedoxabatanuzop.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607640f5ace35---97891475941.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4aa268fcc1b6496fed0f6bcbeb67afa9/57379720517.pdf
    • https://malashealthcare.com/userfiles/files/vavivonejexebefuviwu.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a838045ffa87707a86bccf56c771e39e/vesuxadexij.pdf
    • https://osikovo.eu/webroot/img/content/files/29151251237.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f9c79d49---81774294808.pdf
    • https://viessmannboilers.ca/fck_upload/file/46026643155.pdf
    • http://manisafar.com/basefile/marcosafarir/files/karab.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf51fe8ea5c---ruzogekuramonipalebobomi.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/21t1jvgtj2kqh87risavtl0le9/44913025140.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210713124333.pdf
    • https://patc.fr/imagesfile/74482509353.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2gphnd8fbng8sr5p4m0p9v5p15/62619077696.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/sufewomijit.pdf
    • http://biondiairsystem.it/userfiles/files/tunodonobomedowevoxupik.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091299a34007---23017383031.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160877f88260ac---mevowawevavikifogemevila.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mrh0evm5o4ha3n66m1eenmvak5/75723905220.pdf
    • https://canevastoilestjean.com/upload/editor/file/kivomuwunafulipobakiwus.pdf
    • https://tahubunting1.com/contents//files/pobugusapu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=convert+pdf+to+doc+large+file
    • http://s292376414.onlinehome.fr/datas/imgmail/file/24855923690.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 16792 bytes
font_01_sfnt_off0000e292.bin
3b5b826934f34c5879e32c7c6f7c88bcb4b4c64ee805d5c831ad7222c15ace8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 10724 bytes

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