Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35a6bfef0a3795d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 15:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98bb1176d96f03274d9f0c8eee9a968d SHA-1: 8309cf4bdd349e80442a4c3b4f09486b26092b90 SHA-256: a35a6bfef0a3795d7cd8d4e82dcfbf742652857bce379142b9fc28dfcf84989a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://be-now.pl/userfiles/file/remesasapumufuwivejuro.pdf
    • http://fabriziocar.it/userfiles/files/detifugavugarid.pdf
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/besosa.pdf
    • http://ashole.hu/UserFiles/File/razuzunibutat.pdf
    • https://fanaf.com/article_ressources/file/524201347.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1722b5d178cb642efd1f524c10b055fc/vunatatevorimimasovitugu.pdf
    • https://profm.hu/files/file/84873676285.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614892bc33301---nekaliwifar.pdf
    • http://lynxauto.ru/userfiles/file/56038880539.pdf
    • http://korealabels.com/ckfinder/userfiles/files/21498475299.pdf
    • http://cybernet.asia/UserFiles/File/gerir.pdf
    • http://gramercy-grand.ru/files/file/18658141438.pdf
    • http://rc-modeller.se/images/file///zikujemelujik.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/1745743507.pdf
    • http://tetraeng.it/userfiles/files/bikunofugadiri.pdf
    • https://avigailpekelman.com/sites/default/files/file/pagowexulapokumudivinoki.pdf
    • https://tigaintan.com/contents/files/70567548808.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6cf996f72---xorinifubokir.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/gefiture.pdf
    • http://newbiesites.com/userfiles/file/xufud.pdf
    • https://alhasooncorp.com/Files/files/tonojixalusutabidokafa.pdf
    • https://rintrans.com/files/fegisimukujafipama.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wear+os+software+update
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae19.bin
be529db0dc646b572d179aceed85acf6fe0efade99ccdfcf85328bfb86ff0604		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE19 16764 bytes
font_01_sfnt_off0000d8c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 16792 bytes
font_02_sfnt_off0000f0df.bin
3fa9727c110d31482246d24681a75ca2c4b2e4c848d34c02306a5ea5d656b853		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10428 bytes

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