Malicious PDF — malware analysis report

Static analysis result for SHA-256 5662f751cf1a68bc…

MALICIOUS

PDF

90.3 KB Created: 2021-08-20 17:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fd4ac4895f01c6bb6ac507ecd37caff SHA-1: 11dd54c706e0af11274cbc3201662712b0b2c7fd SHA-256: 5662f751cf1a68bc53cd38250f994a9110cd07537a1961aae27099d3130f4074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or downloads. The presence of external URIs and link farms points towards a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BC%D0%BE%D0%B4+%D0%BD%D0%B0+%D0%BC%D0%B0%D0%B9%D0%BD%D0%BA%D1%80%D0%B0%D1%84%D1%82+1.7+10+%D0%BD%D0%B0+%D0%BC%D0%B0%D1%88%D0%B8%D0%BD%D1%8B+%D0%B8+%D1%81%D0%B0%D0%BC%D0%BE%D0%BB%D0%B5%D1%82%D1%8B+%D1%82%D0%B0%D0%BD%D0%BA%D0%B8
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/27d5e9bf7e33b66d02459d9961be9fa2/49033805498.pdf
    • http://alexandercdg.com/clients/36029/File/gudalirejuwezas.pdf
    • http://alt-1c.ru/userfiles/file/bixaboputinurisegufopeza.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0e2045ae6a035e52adaa9b13d220f36c/genoxufuxexafolino.pdf
    • https://arzhosting.com/calisma2/files/uploads/pilenurogizobitesevoko.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/33bf2c978de884e7f6fdf4181a1dbb29/lufewonomosidukos.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/45304998487.pdf
    • http://erbamedica.org/userfiles/files/15147043476.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9998f512---dureku.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cd2a7b3a---60370801711.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/473373356bec82c2d47c5c12c76dfeae/nezamafif.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6e2c11b20---61630367820.pdf
    • http://absolutelyneon.com/userfiles/file/libotifojuf.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827157440b---xozinabenoxepexotot.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/i31pkjq1lh7rje2rortp2a1420/rovajuxibaniwozedijewili.pdf
    • http://firesecurity.sk/userfiles/file/51197738054.pdf
    • https://smartstone.ca/userfiles/files/piwitereboso.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e150f681---43932567828.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/84bb195a85c34e2bd064e4c149e32d81/72461920109.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/14304526324.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f06611ff4adda977aa87d16aebc2a623/24416331610.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/34f10fa0ccdff36f1e2197b96876a024/4375711828.pdf
    • http://alacarte-grafik.de/userfiles/file/82010244929.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_off0000eade.bin
ef83b0d73e53ffbcecb0aa9e3920064613089517b7ed51cbf2d967ed983143c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 11560 bytes
font_01_sfnt_off000105c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16792 bytes
font_02_sfnt_off00011dd9.bin
9b597ac51c49ff20e422bb59cdfef24b022e0f81921d48a39640e15bf551652d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 23056 bytes

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