Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d9de615e6a7b8e…

MALICIOUS

PDF

91.5 KB Created: 2021-07-01 12:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 548395e3843a7066d81275517701352d SHA-1: 25936cb8e1b5b3d89bd0e916a2d7e7e7f559cdc3 SHA-256: 90d9de615e6a7b8e78f0dcefc90ed1f7e1451da3dde65bfc73e5f600e07d23fc
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://inwebjor.ru/uplcv?utm_term=haynes+chinese+scooter+service+%26+repair+manual PDF link annotation
    • http://solamsys.com/userData/board/file/7233621624.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/71352462103.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/buvugawoxitokure.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb462c4ea---wipoxa.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/28178799993.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/34930843558.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/lowafisewususogesa.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/furafebo.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/99689309239.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e202ab2c9---zodevadolozuvaxiwiduxulu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d089d097---92383752833.pdfIn PDF document text
    • https://ksboutlet.com/file/files/98315560075.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55c26f0c7---pagofiwexotemoki.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a5329ddb---zigukexarut.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/992b39f42bd4618d8324b8be6baf25b5/45035892685.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/natadiwaruzutezuvomaf.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/75467161631.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ec7aa8d5---visunuj.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/38504102138.pdfIn PDF document text
    • https://anaksemut.com/contents//files/51514012118.pdfIn PDF document text
    • https://isosklo.cz./uploads/wopijexukejinatetono.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ddb4a3dc9---tazesevagerow.pdfIn PDF document text
    • http://learningkey.org/userfiles/nanoxavuxukupumitozakopa.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/togosuwutabixoxirinij.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10452 bytes
SHA-256: b4dd5390f887de8c2b6fcf9a5f7903fc68ab0567cc13024bf6f681720fafa48c
font_02_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 17676 bytes
SHA-256: 44dfd0dc07d669f31f9d44f437cd708b67ef14fe9ca24b82ee2b9ad9976a79f2

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