Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1200ce3d93af92…

MALICIOUS

PDF

95.8 KB Created: 2021-10-12 17:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5f687589db7f2c9cde891347e6a6646 SHA-1: 0333b8f0001b01bc585d2307a7a9169948eb91fd SHA-256: ef1200ce3d93af92de1cd0308d81c7e48cb9f8df6c466cfbb635e9d84429e393
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external sites, with some hosted on compromised WordPress upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://f-kcc.jp/user_data/userfiles/files/40411683284.pdf In PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/29803004223.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/bifupaboku.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1534865c---4323894525.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/59291281584.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/vosos.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b4bc6ab78---tuwubokelipix.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/28345574497.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/84423910390.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/fukegozawurefawiz.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/99682224683.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/xunosurusukute.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/97875805245.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/31460034790.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/jifetovifudurewagidofa.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/tapegetaxipukude.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/49669242137.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/waxexewonidise.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/29683834585.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/widut.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/82525281061.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6cd797b2---58390638689.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/zemoleletolidobunibe.pdfIn PDF document text
    • http://computerdoki.hu/user/file/48409160148.pdfIn PDF document text
    • https://tdfstore.it/file/2215119267.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=atheism+on+the+risePDF 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_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 20884 bytes
SHA-256: 7793317aec6d41af9b4da3afb4c1a99677f9705cac1833d08b7139d19ddb953b
font_01_sfnt_off000142e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E1 10148 bytes
SHA-256: bc31a006429a658aee933bda2c4dd483bafbdcfcbbcd9b30d89966d265002a7c
font_02_sfnt_off00015963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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