Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ba8f64fa6836d4…

MALICIOUS

PDF

105.3 KB Created: 2021-08-03 14:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8b5a80280e162a5a82ab84a27bfad3cc SHA-1: 8edd45627825658275083ac6bd02fe9a2a8e1042 SHA-256: 26ba8f64fa6836d4912bff9967baeb5e9b1b63b29d2d05a40454aa8fe1a2d8d5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://droprint.my/home/ququ4923/public_html/userfiles/file/93440624238.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e33aa81aa---14779603795.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/9720825460.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/jikagino.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/af6l2c7c3ho42gbbgsumf4dvoq/39428762464.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/segvvlbb6dvde275ukeh7pq4n0/64505323075.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/23605668286.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d051a2e82f5---nafalojofumumezefalaru.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/lewajizomubajof.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb855152d2---48521253398.pdfIn PDF document text
    • http://asfalon.com/__files/file/doxigepokimegonedirajibi.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosebexitafujimemogarore.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/tqnr9u4b0oup29ddmfbaq36hf7/zejabakikupufa.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/luselozoj.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/xaxipujukazopas.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0f08ac8f---7251018983.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/36a68b893fa4a80d305194422b67d2a4/jojexupa.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/22762030948.pdfIn PDF document text
    • http://getem.pl/files/file/84758054063.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/34967472339.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c10d985b3c6---rabinifine.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/u1uqh6oslmb602gg9gl9bqkr9r/91103825961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cv+resume+free+powerpoint+templatePDF 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_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 17464 bytes
SHA-256: 35a23c6c98740134d20004bcbc28bf5bd58523a4bfb0cfa42e1bf8f3c32ce506
font_01_sfnt_off000165a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A9 10804 bytes
SHA-256: 55b3b48fdfe98a45bfc0af37477eab74066e72b54b2767cc44bb6859d4ef75b0
font_02_sfnt_off00017ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.