Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9357d2a3bd75b6…

MALICIOUS

PDF

93.1 KB Created: 2021-09-01 02:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae177164c1a1ecf1b03b0f59732cf8cf SHA-1: e7ae5269e436240aebca52efca163b4481887c70 SHA-256: 2e9357d2a3bd75b60576c8371c7e8dd253d87dbf489e2ed3e7a8d20acb359825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://nomylo.ru/uplcv?utm_term=complimentary+meaning+in+tamil PDF link annotation
    • http://studiogallerani.it/userfiles/files/nozizuda.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/jawufumekuruzub.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/xajubi.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/11338470613.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7c7525b6---watilefoxexodanofis.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8414f06e6b---kinisamovokatowaxirewana.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/887c4bb9935ce7ce986258f163c8af5a/rejokanugisoxutezudozizi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/29200376851.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607118504507a---92935296177.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7c46bb5e---satetadofupugubo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9f9b52ad433867070cb02eff5c929fbf/fapulebasiwa.pdfIn PDF document text
    • http://flgr.ru/files/files/jukemusutevakibesuvojin.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/78852206203841340f3449290fc2bbd9/dabunotaboxorowuwu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29157528974.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/58220961411.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/ruwidorovadeselid.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062109430070554.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9ebd1894---bonazewujowulofamokos.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/dobome.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6ir4tk5s6o49k4hmqv15agcp8b/52117920745.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/t8n8b75h60rl22kbapmv1rvrs7/71749335612.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/gulupuzolefusojaje.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bojiropekegivusowave.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fozuxiwulasapabimonim.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/liom3jji7nstodsjmmlfbn7h6q/29615140725.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/fivomibamaril.pdfIn 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://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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 23980 bytes
SHA-256: 83ade84bd15d1c2160f09daede6a4bf94a2e96d00e68000589e0b4ab3a0c3eca
font_01_sfnt_off0001150a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 10572 bytes
SHA-256: 4e6925f4144f11a6bc5ce84e8219ca9343762ca58bc91e53a69573c765ef67f6
font_03_sfnt_off0001351d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351D 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_04_sfnt_off00014b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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