Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a942b1bf70aa4ee…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 03:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0382fadd9d0d3ce36ade9c0cd8f4e22a SHA-1: 3ea323ce01c108767fbd6a4650ebad8ddf4cea7c SHA-256: 8a942b1bf70aa4ee3c7acbc2e367b9c5de5ef381cc94d0d25c92305d22ff6717
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://janaturismointegrato.com/uploads/file/vuwogikusefomavitewin.pdf In PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/4001130153.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/bezapakuvuduzidutubaramab.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/leluzevafa.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7aa1b4847---89404009491.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/92770529444.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/wogirukatorinanowipoki.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/90886917248.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/68127955009.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f57f153619---dutisifisud.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/47455316886.pdfIn PDF document text
    • http://hocomesun.com/upload/36036642287.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/tiverumedaf.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090205494152936.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/82994719354.pdfIn PDF document text
    • https://phr4u.com/files/ruzipasode.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/28030238c5c41802fbc8a209fd90f3eb/12413850496.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/zaxebiwubafaga.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109130450465131.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/11223680930.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/maworidinof.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/81947006039.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/diguvixajuxeran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pocket+tv+downloadPDF 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_off0000c16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16A 10248 bytes
SHA-256: d5ed4529cc0e8471650ee9092d31ba708483b56ed0cbc95ae780dcf51193dbc1
font_01_sfnt_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 16128 bytes
SHA-256: bd6157086307754317eece2e1aefc9950907cbb81a74e8e578249930aa6da31c
font_02_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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