Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad691837dbcf2054…

MALICIOUS

PDF

77.9 KB Created: 2021-08-28 02:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 552637f6bec381745af7637772e2bc6e SHA-1: e194c6a3c0e20e726933a9930d731c1f473e8787 SHA-256: ad691837dbcf2054dcbf94450111d9c042eec007de2fd8d8399a21457c56b6d4
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b91106e0cbc---47105171415.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/i1krov1htfphja6mtnkkhr7opt/59707785108.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2855af8fc0d7c1be37fdc42ca67122a3/18233764983.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/r3fjl4ma4gl30js7dp1vgn969t/zavoxetu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e2ff0be2825c4099b476cd8c3218e92c/30410919370.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/gopisizeterivajininik.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/52097682655.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/7979749277.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/26780767286.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/99467159691.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/cb41ebf317ab300b76b49badf343252c/zifowewafogomibo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3f1c368e8---gebagisutida.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/59870652656.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/70283474976.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/61887430949.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/zewesaregejududoxawenefar.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a2f341d91facd38364c2078dacd31942/zafon.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607060ce00592---39157026394.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/rufonusare.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1cb741f39---37957048533.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ea8302333d7f5af8fdde7d63f927e36d/nugezefure.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1c1cc562b---47972083954.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8dc48d69fa976c969feb473ff56b2048/pifajotawisupafaweluxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=love+and+money+dennis+kelly+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 18148 bytes
SHA-256: 47ead6aa932cfd690207daf79de6a6751055a7fa5e79edef95c313117d02a047
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10688 bytes
SHA-256: fce8a0813e1be1259c991fe3f596da8237652fb50a2673f1c284472cae4ba7bd
font_02_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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