Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86b9fee98708b18…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 17:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2764f7bf63947f55a3e448c2e47fdc9 SHA-1: 2bf00a4dc3e616c7d1a4af84abfb23849f7deebe SHA-256: d86b9fee98708b1801536e44f61798bd3f61c800cac041dd9696c35c15073c96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=cara+download+goat+simulator PDF link annotation
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161385dcd3e499---43283094540.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/90534468082.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/13061477533.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/majajena.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/86444315894.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16139d06c0bd5d---setudutobigabofibudi.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/buwajigitimanared.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6e8be7030dd3d396784f6d96ce60a51e/2204559910.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/wamumuzeguvomufofiz.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/rapotakutejiponovez.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/16285133657.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/padatozufewakulemerus.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/79553985666.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/51597465925.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/vodimopilexuwo.pdfIn PDF document text
    • http://kelsenator.com/userimages/57827511673.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/39307215825.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/wokekinepubot.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/13874320401.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/letij.pdfIn PDF document text
    • http://drironcat.com/images/file/79103114557.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/40909575733.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/79047803867.pdfIn PDF document text
    • 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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 17676 bytes
SHA-256: d97e563a07ad18631f90f0c5754cc0d0baaee742e9a7175fc559ba34d3187eff
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 10676 bytes
SHA-256: 9625cae57d3ebe91d322c2988165c6dcb767c93f1ea350ec964fd662ab3428f8
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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