Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f291c635550c639…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 03:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b21b6d182d83d9aeb6b78be20e283ca0 SHA-1: 06d9cc70dc2b02d10370b1c270c08c3251a58dea SHA-256: 5f291c635550c639f0acc929df304bc8ebfa865a4d48d321526c46a6459be628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=best+backup+for+android+without+root PDF link annotation
    • https://grandplaza.bg/uploads/assets/file/dezekasor.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/pinuzam.pdfIn PDF document text
    • http://tayles.com/uploaded/dijezinakafuvegebapevof.pdfIn PDF document text
    • http://compsult.net/userfiles/file/32908362801.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/bomotezala.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/99818295384.pdfIn PDF document text
    • http://rs-entp.com/upload/file/27126646992.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452bda1076d---nodafonebonejixugut.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/sivepitipozeko.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_DC442BE7464DD5EB.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210906185920.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/95538065355.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e9241de6c---tafata.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/bokenijefotugami.pdfIn PDF document text
    • https://resicolor.com/upload/files/debesugazofeniloronudemo.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/nakituwenekulenesabo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5eb58602eeb371e2d0f957a737573292/dexajugomodoputepow.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/11966439887.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/306d898fd52045b48deedf18a4a37c71/87678946098.pdfIn PDF document text
    • http://vasa-project.org/fckupload/file/74386415248.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/85214759095.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/kumexexomavoxobeteba.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f6e84e5e---27594030612.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96a1bcba0---gojedojaguvesu.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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 17620 bytes
SHA-256: c669263497d98804c204aaee7f855385cf911c7582b3b1147b5446f957143c43
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 11144 bytes
SHA-256: 0d67ae6e9ff40ef48812ec85c70db25e173f7220bfd06873383d529fd2a90f0a
font_02_sfnt_off00011c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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