Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b9a72dbd8c3365…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 09:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d69169178073c6cf8db6164feebf488 SHA-1: 2bba954a2f9bfaf7fe62f821bd1025cf2fb1995b SHA-256: 93b9a72dbd8c33650f419ab855f2c2a8d4c2b57a32a17385b377d49159434ddb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, 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 0.9911

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://glaze-metalart.com/upload/files/texabutenarolawog.pdf In PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/sirosawimixujegani.pdfIn PDF document text
    • http://hydrem.ru/images/file/wodidoko.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/42776245118.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lonoriliken.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091716312612.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/73401435978.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/gotifesok.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/bamexujaronazosuraxiwe.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/16719917528.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/bepolirezepatosalel.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/68776002532.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/33562350704.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/kudifebuvod.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16147fcee7681e---19620970337.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/83310336980.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/meker.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/mefedebagogag.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/luzapekufatuneviwinajit.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/wosafekekorurusawedixa.pdfIn PDF document text
    • https://rm-parketi.si/uploads/zotesigagupupogafuneden.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/62374778300.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac9657b653---27819757479.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/92416399543.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/sefupon.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/nukepibiga.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2fba282ff9c463bce20ccd6e5cfd7835/movozofazaxorizuvukupefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+version+for+note+2PDF 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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16780 bytes
SHA-256: b74a237c140d7c6a11a4bc5327e486bc24d82a05f14168b19bc729b247d017ca
font_01_sfnt_off000106f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 10308 bytes
SHA-256: b3f198efa200c894941d3c56e5543301abb8882112acaeec287b15e45549e3e1
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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