Malicious PDF — malware analysis report

Static analysis result for SHA-256 138df87eb206fef2…

MALICIOUS

PDF

95.1 KB Created: 2021-07-02 05:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e545cdc388e51681e8cc0d6be3c8fadc SHA-1: d557cc8c106f093135fc2cfe9605ac4a3ca8f8c5 SHA-256: 138df87eb206fef26e31aaaa2675e7c807d20e5afe397df4ec759501b4e8ecba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or scam campaign. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://crysiq.ru/uplcv?utm_term=percent+composition+of+cu
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/44bd1e1000ee567dadfc3bdb3a359056/85560597408.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/pajekuvuvab.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ki0m6n48fk7arhkciljgirucvi/kefakininixo.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/011011f0c84b890ed755b7a0f85c69a4/53910975752.pdf
    • https://aartipalette.com/userfiles/file/62546445540.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ea374439---57928691094.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c01673284af00ef999494b9001da9182/kupebomebulesuziwome.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8b21f6cdfa6eae62e9ffe407f52635fd/64863853862.pdf
    • http://pspectr.ru/userfiles/file/58028241475.pdf
    • https://akproauto.com/nbloom/fckuploads/file/97297134974.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qnc3d0spmcpfnd01k1ffavc5qp/rabugumuzewigasude.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/dc80a597f729b3ae712b0cd7857b1434/bowiz.pdf
    • http://gursakaryahukuk.com/images/file/giviwubo.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef57d9ec96---47741505253.pdf
    • https://p1gtac.com/uploader/files/dejogusomarubaxesagawema.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863360edd64---80186146123.pdf
    • http://bioident.pl/photos_fck/file/makive.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607944cd7fb34---96810150952.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42ac3a5d1---58277339189.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1523394d41---turofubusukuxek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27a3d609c---kefexeledaragisubetatijo.pdf
    • https://secolink.sk/userfiles/file/liwavetibefomedilovomano.pdf
    • http://quatanggiabao.com/images/uploads/files/gasasadamelulanafu.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094393ed9d1f---lanalipegufe.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e31fe3de40b7f23e1fd9eb6295feca7b/4670703913.pdf
    • http://polishingmarblefloor.it/userfiles/files/bilubipolar.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f68ef0ab8232ce9a99953e8657b9616b/xamivuzeti.pdf
    • 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_off000109e0.bin
e7121de51d8b52cc73618b9422160f821a495bba7b27b29d5c10fa9e5e7efa51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10532 bytes
font_01_sfnt_off000121dd.bin
63f2ee74303cc4efd012f666132f47228b8c77e94a5b70ccfbdb3baa7c50becf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 20040 bytes
font_02_sfnt_off000156ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156FF 16792 bytes

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