Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e893e9bd1fb2705…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 01:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93878ddce73eb15c5e10bf0954f76b4b SHA-1: dabfee5b87d7c791420331744d5418a59db18353 SHA-256: 1e893e9bd1fb27057a1cde0d9e268c7e19997ea55aae8122c58f23235d5ef9e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=present+simple+negative+sentences+pdf PDF link annotation
    • http://a-aqua.fr/ressource/site-image/files/32112708852.pdfIn PDF document text
    • https://aedwea.com/upload/foto/kelezam.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/99bc8b035357125e01788aca40fd55e8/61299737209.pdfIn PDF document text
    • http://keacg.com/upload/files/30926408051.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/76893566362.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/57525040493.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/22a7e31cf014908de1e4b48b847eca2c/57209634953.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/14394662675.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47de642524---repidavowezazitoma.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608168556b89b---somawutenonemisoxi.pdfIn PDF document text
    • http://cl-pub.com/files/files/89206715118.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/47789252602.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/89e4b42c5420bacf69d4214e6b5927c0/manenegesopiromazex.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c25ab36ba---pixajizavufutotenefik.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/98933049790.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc490270d5---kixojugaridik.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/56479696683.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/62776481243.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fc361c29c0c995674fed1f095f2a8e30/52788991686.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/43n2gjbokjknqfh3jujco79g37/79588218399.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2753bff268b8d0511bbf57e813518da9/ginin.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/tuwir.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/87450858478.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0qtr4pml22qp99kqn4om5r2mrn/dapenosanusobuniwov.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0a92492a33b02fbce9dbad70b3440c55/28869498447.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 10912 bytes
SHA-256: 0b554fc28075b8badc2078772d8fb63a8f7ac0dd826d1fad514ea7a951eb27c0
font_02_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 18568 bytes
SHA-256: b6c8ef64ed2fa2d446f1cd4119c563cba97926a1b7400912d6cf26f2e6895f6b

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