Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e94af7b8381f41…

MALICIOUS

PDF

109.4 KB Created: 2021-07-02 07:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 31ed0b49070e18aba688b3dfcbc088fa SHA-1: 9f5f54f1de7598558980e5dddddcc906c8016136 SHA-256: c8e94af7b8381f41bcd39eed74bd28d6be216845fb7339ef0488771e1823351e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63cc1f4d3---nixigo.pdf In PDF document text
    • http://hrudolf.com/userfiles/29400337914.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8980cb6fe03b168fe7f55a14b70c8b22/75002739526.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/zuwafelegumevoraziwimipa.pdfIn PDF document text
    • http://effektfilm.de/files/file/sekamimeliseberozato.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ph8g31n9rt2uos7jig8jlkkn6f/vigexagijisorezegemipor.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b06c0d1ba---safufomizem.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/48413794055.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dab3cb50476d001e11c8b22f38accfd5/98472380985.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/10122034434.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/18869489200.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/zegotuwela.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be93443b442---namimoku.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/66168869509.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076f89a67e5f---mekorowemigetonupalen.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/25716712209.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/21477959886.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c599b6ead87---sirexagutakojekowusegase.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ce816fa90d29e361d2f638d59fc1c962/vepefagimupaloxiv.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608482a6bfa05---fexol.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44567c3a4b---luketigo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6dbb0f4f4---wiguxulinetisawexax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=skyrim+quick+conjuration+levelingPDF 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_off000148f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001610e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610E 11128 bytes
SHA-256: 988be909d41397e9d1c7f02514045494a9651bc8a12c51149dc2c4211d115095
font_02_sfnt_off00017abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABE 16900 bytes
SHA-256: a239ba2fdcd158ddb53088a02d655177d10d8be55895c742468d464708904996

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