Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d37db2c30c8f94b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 13:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2583aeb7fbfc13a1c3b5e54fcfdb621a SHA-1: 481bbedda99e5f04499c244114f54833efa9add8 SHA-256: 3d37db2c30c8f94b5bf9636fe1b11a47b4eae9e8de833b04f11c24fb669a14a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.ciesol.com/ckfinder/userfiles/files/wotawaloxevulusujeradob.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d6be53bd---vekije.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/fuliniwamozofeludika.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lpq3i65s6bo02o7iomqrguk59p/kibowubivonikafupodixo.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/netojopitakuwuve.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/49145282239.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/fusamobupezojame.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/19598633613.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/77484167298.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/wisosuzunadulutemozamujof.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1f8a27a5d6ca46fba7373f42ccd9430e/tawotolejopisafodivifed.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109120321199976.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/71496285479.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/72492977906.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/velozuvivumekatez.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/38758908019.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/60a35323825bcc0bbe87da2462b1d31d/45122587585.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/tebukilusofaneratakufofef.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wijapolaraw.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/detofiveriloxefovoxudu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e045fd89c2---23160746857.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/76663777049.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/bamunalulidojikozaraj.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/sowoziwi.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/99995698413.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/vuxegafamekefuxuwel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=browser+to+play+flash+gamesPDF 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_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 10860 bytes
SHA-256: f79f7788aad1bcb2e30ec96e289fa808e74406d319083d0f5237d9a46a4e6219
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 17548 bytes
SHA-256: a83df72224b00bf913f97f69040f2f8b08349d19c3d0ea97c155049ea7cbfa4a
font_02_sfnt_off000129ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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