Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e6c78a6b9a33d…

MALICIOUS

PDF

89.9 KB Created: 2021-09-16 14:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: accc239c6273b3aca332a024d56e7c0c SHA-1: d3adadb117c2ea0eb613c29cf28318c80454af93 SHA-256: 8d3e6c78a6b9a33d131fa431330ca254aafb8951906de4a6f14f76c1fd3b9fc6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple distinct hosts, some of which are identified as potentially compromised CMS upload storage. The presence of these links suggests the document's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f53865a6---menogedukalitapomux.pdf In PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/51740635314.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/pifalokuwemebejekerego.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13e8c12eb3ec417dcfb9300c67f8e7bf/veramuji.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/vifepajubelolobatawo.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/legajunew.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/50463316883.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/sodesux.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/sedovijisawonovodab.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/13978460705.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/xumesudezididi.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/49995605711.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/fulitawejofilojilupag.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/79478625796.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/boxusuzofomezagisumo.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/370506322.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/80347194097.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161406258d2aef---jidulolezovetusexurelulom.pdfIn PDF document text
    • http://rotang.net/userfiles/file/tujexuxibe.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/nolekosifegupelojavoluji.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/diwetixobazopame.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/19158880987.pdfIn PDF document text
    • https://digireg.se/upload/vigidezuz.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/golujekevoniborawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nfc+programming+appPDF 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_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 18472 bytes
SHA-256: 76b9a421b02c1166999630cbb728cea6aa2eb78250d168b327f466088a6b13b0
font_01_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 10356 bytes
SHA-256: 0e269a97fd0cf59c73e94f372116b394fd07dfbb5e105681f031a50e38ed4549
font_02_sfnt_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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