Malicious PDF — malware analysis report

Static analysis result for SHA-256 b152092cb752063c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 01:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a7f25ac491873fc5b447d15790cfde9 SHA-1: 5b569d61238beb113012a1a48493ffd6bc57febe SHA-256: b152092cb752063c12317f3239615ffeff71b1ffd6bb4d2904696a0436981a35
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to various PDF-related download URLs, some hosted on compromised WordPress sites. The embedded JavaScript likely exploits a PDF vulnerability to redirect the user to one of these malicious URLs, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://loctra.net/userfiles/file/mosalokufeduvizorumamadot.pdf In PDF document text
    • http://ledseoul.com/userData/board/file/sogajogakilar.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c10e42d261f211118fef1cf8954aef82/libikakopidevunevewixev.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1628535124wokowudos.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/kutaxazazil.pdfIn PDF document text
    • http://skomi.ru/img/files/file/39326360026.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/rimigarewixonukonekadobe.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/roxipoviwagovofivudiw.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609472d545c30---zojemixitowiguviwapuni.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/813eced39877c4fbc3701727d483200f/nutivosefoki.pdfIn PDF document text
    • http://abofahed.com/userfiles/file/feleral.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c2q7d7cfcg8k7enrslc32ck0en/zibebuvamuvesox.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/16474161358.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/forif.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/totolikirowapisevuvari.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/43864706097.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/74429726020.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/4147619519.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16101466b40ad6---mafaxuweferobutazugil.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kuwidaz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8a2b4f0871f778406cb670d23618ff6b/49596999261.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/u0ftefiid1hmufebquq71sur64/21307407430.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160824a51bca5e---kuriwojovelositogarezadu.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/60017876359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=remove+pages+pdf+free+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 17956 bytes
SHA-256: 88e54f0caef04fbd29c82ccea7c8848ce8f753e56e4f4d8e9e1493ddad47fe8c
font_02_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 10852 bytes
SHA-256: fc0cb5a190e65efb36a60aae8631daa3a56d346231d573915034c325e37bba1e

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