Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fbd44983aac5b4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 22:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6de2a312a82e9c16a6468cb7b090d0f4 SHA-1: 960189bfae8f6cf52ddddc1e3d8df049ad906d9a SHA-256: 83fbd44983aac5b44fca2a4bcc6909ba8dd18a01f1e187f7ce6f5fd4c3b0cde6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or use disposable domains, indicating a phishing or malware distribution attempt. The embedded URLs suggest an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://arch.ua/ckfinder/userfiles/files/85004044334.pdf In PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/pelida.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613069f1c32ed---lawufezagulixazagesipixis.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gevafizibazekef.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/12020575763.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/34284496063.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/nilivuvenupovusevonev.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133161071c05---nomiwifudemijavigu.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/lezepe.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/lesisuduki.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/011848364370.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/lojiruzumazoxokel.pdfIn PDF document text
    • http://dytac.hk/userfiles/82917164903.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/46c2580a0a9ca0ab7fc7e510a40edbf2/vasujuxuzade.pdfIn PDF document text
    • https://ags-car.com/upload/files/82148635005.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7h18fqnbc4ofg970vvtu7qd575/84993417057.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/49514081494.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/20661622204.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/73009759778.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/66622687200.pdfIn PDF document text
    • http://lex.tj/img/file/lusakazag.pdfIn PDF document text
    • https://nevisnews.com/userfiles/14776414210.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40419571887.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vosozofeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lg+phone+stuck+in+safe+modePDF 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_off0000cdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 16508 bytes
SHA-256: a18f04737a982574a6ab440b1ff85f4793ecc21ceee008dec89df5973d14bade
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 11068 bytes
SHA-256: 06ad9287be01236e9c101a4008647850ab04d44bdcf2349d7ab25091de9fce4c
font_02_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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