Malicious PDF — malware analysis report

Static analysis result for SHA-256 2808e55cdfe45f4c…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 07:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a9091ae3fa47571ce8babbd41f13bfd8 SHA-1: 9fb00aafa5b9e72e83f4b191cdc3401f110cc2bf SHA-256: 2808e55cdfe45f4c1c7f2705280869926e7bb893689b661b77d50c6116a86f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=good+luck+on+new+endeavor PDF link annotation
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/epg3t9m4r9bka4r843u2nk20tv/81172967094.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c000b6ba551---digefavade.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jokuwanisadepo.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/18486099910.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ebd1b8ab9---zugite.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c07146a4cef---vonafosiniz.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210601_2E0FADDC132EF5FB.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/27070554450.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b18c90ea08f---45430328443.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfee51d83a---26902736595.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078466d10866---lunikexonan.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c64ba7ca926---27024330501.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/watigilorera.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/49ebef1f9e31f37a4da2788ba23147e8/sugarup.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf27af285---6460521933.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fenajozogavimiranoliti.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/23331344965.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/jububokebal.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/jinin.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8a05465f0b6e1e366bfece0d0f114a30/76003715160.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/62930169099.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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 10388 bytes
SHA-256: 65bcc7f947c49ca639eaa05d18a134be55741897712d291eae6f8702193bcc58
font_02_sfnt_off00011b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B02 17556 bytes
SHA-256: 3e38280f0e42845729348683b49e64e742e2f4bd809a0430e3e19d5da793e10c

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