Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cd7f63897db13f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 00:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd790e1e6cb4afa6f08efc5606372790 SHA-1: e16ed8a7728bfc19c239c0308af89d87735eda66 SHA-256: f6cd7f63897db13f3b1048ebe5123eae5afbedbf04281c728318c9aba23c1027
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI links and the overall structure point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=how+to+make+a+video+a+live+photo+wallpaper PDF link annotation
    • https://torgradio.ru/new/files/file/95318435597.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/nipelukozasonapif.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/sukijegedibaxu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144917714f18---tabedabim.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9143f2638---kinejavefumejusikixevap.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b91850aaa9---nowagudapogirenokafen.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/bekepuxirusit.pdfIn PDF document text
    • https://kawanmto.com/contents/files/18085633741.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/90582174572.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/19433762033.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/namezujerezolazowufowa.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/3702810235.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/11393196202.pdfIn PDF document text
    • http://alptw.com/images/files/potowinozejeruweti.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343de65aca4---gorolozepijujusunujubosi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/31757c3994fa6a58eabf6450a4bf1e25/16313696454.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kuwim.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c79eca0224abd28ff729c92ae6e2913/15414392981.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/lamaziwulizemoj.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/23971976312.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109200606314501.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/wixupewazon.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e01e69e34---48942031131.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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 10620 bytes
SHA-256: 8c2c194f03834b8ccb64120540780d37646936468519c4de7721429e5094fcf6
font_01_sfnt_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 16236 bytes
SHA-256: 5440ffe210693062f86326777199a6f4e188ccb262edca07040124a3638c072e
font_02_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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