Malicious PDF — malware analysis report

Static analysis result for SHA-256 8859c4fa3235ccfc…

MALICIOUS

PDF

87.9 KB Created: 2021-07-27 08:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b09df36fd5841a9a1fb5ca93d40dc7ae SHA-1: 1ef2977f515b024a1eb37eda028d48b48eb3f9d5 SHA-256: 8859c4fa3235ccfcdeb4cecfdeefcc25d28028fc5b057faedb1f9e1b6815c6d4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs, such as the one hosted on sakirnoopo.ru, are key indicators of the distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad49504ec---89865562830.pdf In PDF document text
    • https://hgb.se/filer/file/bokasom.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b801ad3de44cf660e0616f046178b4cc/nafizok.pdfIn PDF document text
    • http://envigest.cz/upload/file/kamezala.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091c0350e0cd---luxamuxigovaluwis.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/wenitumufaru.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/75870c551627e4e19072eaa183bbd33d/zonilanobelewurelobo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/44090e79369ffcb9040e36a3873d154e/dekiwopubezukumet.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/wupaluxikoxitij.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/20774494275.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/593848e6b486419bf2bd54969b73cfa1/69901047175.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/f3c3f6d46efe7e0cc56f851192036fc2/19613353627.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/letilexoburixorubada.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/409f197a2c1181b9b07f19ba884c905e/92006182037.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5l9m2oaksccv2mn6ndd4p50ios/duvuxop.pdfIn PDF document text
    • https://aashianarealty.com/file/xinux.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/49385494295.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16087300575625---tokaxorutufuxavimabowipum.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/23829482017.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6a8e800052f782da6b0bc67bc55f6389/37267940893.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca53526d65---xomezusajumovow.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160727f2493560---lumuresasolig.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/wimaludizebikawamemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+use+smule+vip+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10496 bytes
SHA-256: c177e1b8f48294c80db4e80bfa9b1d2094121779aee4f1cad33b8f8b8506988b
font_01_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
font_02_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 17264 bytes
SHA-256: d92d4265f5f4e905ea11e2e6cce2508049177e00bea89028792a418c9e7fa039
font_03_sfnt_off0001399c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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