Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5954231494ef744…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 15:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67809049377aa9deabb7ebea9ab03801 SHA-1: 23e56af2017c587004ca24609119dd20a8bef06d SHA-256: e5954231494ef744780a3c36f69a5db58239b744e8afa625a0ae5e5c4669e0b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to potentially compromised WordPress sites, suggesting a link farm designed to trick users into downloading a payload. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076698917ce3---gudogoninow.pdf In PDF document text
    • http://stphilomenaonline.org/userfiles/file/veseje.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmp3gfi5d9gekqlcfd50lduq2m/nepoxonokezato.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076171fc7d12---dabovelife.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/suloberitotula.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4384b71f82b82ca5568aecd0f6c2d3ba/pexoneferaxu.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/27588424000.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ea7366d4961595f669f87b7fa56638d8/55145294835.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/xosonem.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/44948343630.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4720e41e8e---71140541060.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/5160963258.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/52190872681.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/sibepomaburerib.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/fagadulakagalig.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021070812371055.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/resudibameluvulezis.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/tefituris.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/jujarepaxu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/dbee6eca2eb87403d17aa6c3ad149aca/24141692772.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0adfbf2070---33705686365.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/20571489261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=emotions+worksheet+2nd+gradePDF 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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 17652 bytes
SHA-256: c43cf0088bd6b37e0a2b105713519f449c04569d6056c18e65e38caf3cc8dd5a
font_02_sfnt_off00011ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 10932 bytes
SHA-256: 5bff62ed0dfff5c49018cd3762c449f1b0845a4c429271fb4dbfec2fe50341d7