Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af94abedfa66fee…

MALICIOUS

PDF

82.3 KB Created: 2021-06-13 12:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 53bef47ba987adf5efa99aeede9ff265 SHA-1: fd2377c54d82fecc44e21324a2edf2419591d3f4 SHA-256: 6af94abedfa66fee6f35c35bf8ba558d65b3e1ad4f829b9af2008133c802dc4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=boy+with+luv+ringtone+instrumental PDF link annotation
    • https://bawwabatrizq.com/userfiles/file/10520777750.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/860b38fda157fcd7adb0d94a284da082/guzewurededirumewa.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ccc2ef57df08aca3daafb18745c21b9b/bojoli.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fdcd26116cc56bd36e7d6893250bff5b/18344195667.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f08fb54929d7e19ed0d66708f84e85c9/zubolekogurubotezuxaruwum.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d89c4b55---54591832938.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bdeace3d---nagipulidonabazuladopuko.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kibakomazavatoderobaw.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d1e805685875f2ad35b1b5c9cc0978ef/18085593962.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/61b018baa15f1a54e31c3848ae0333b3/kokug.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838fe65dfa3---marivofivakevagijutul.pdfIn PDF document text
    • http://planbmedia.hufiles/wofuwezurel.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f1d154b9---wujarilus.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078983056305---vewupulorok.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1f599c7511ef4acc1c9e5dd80d6d0566/99242671308.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061213441573499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 3052 bytes
SHA-256: 32cce48cb69c5766fd5cda67eb76c4332572a0516ef8d2fe0ca111666528ff84
font_01_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 5404 bytes
SHA-256: 0878354a926cba4f66c235cc380155dd447236b8f3735617b6f4efac6b56395c
font_02_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_03_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 10772 bytes
SHA-256: 22d3a4bae749a7a71f3c75d1c86596615f7c931c7f8da46f9b17acaffe14c281
font_04_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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