Malicious PDF — malware analysis report

Static analysis result for SHA-256 90806be7bcf1dc40…

MALICIOUS

PDF

85.4 KB Created: 2021-10-21 02:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 447f333b4b23b1550764c4170b54e389 SHA-1: b9a5fa3effe1fe7131920d6bca1eebd2ae8b0099 SHA-256: 90806be7bcf1dc40b63ce3bad651982e433a713f8c9ba2f98b32b8b346978e91
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites, which in turn host other PDF files. This indicates a link farm strategy designed to obscure the ultimate malicious destination and potentially deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://studiomistretta.com/userfiles/files/sadogagumogizinusaneso.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142c9af91fd1---82980122926.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/11608365365.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631577924JKbp.pdfIn PDF document text
    • https://priscar.com/documents/files/kivikesimep.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/gawaxenulavuvokul.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bokiki.pdfIn PDF document text
    • https://mimpidia.com/contents/files/netoxerenujob.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/wuritedir.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d11ba5195ddfc5295d2aba32208f725a/50760407726.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/884035697.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/nexelizuw.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/823092eff8ff59cbf730ef355ec52070/temuxotijegofipala.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-10/file/LwpCms2021_10_09_23_36_06_5571.pdfIn PDF document text
    • https://dacola.com/upload/files/riwabuzew.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/vuzaginofepixikavu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16164d3c2489eb---40265376172.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/vebuko.pdfIn PDF document text
    • https://brukspec.pl/upload/file/28617092536.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615070d78f5ce---tapaporikagodi.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/rufugepejosifegidi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1616d5cc9b7b62---gubobojotuwixomasoto.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=topic+sentence+and+supporting+ideas+examplesPDF 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_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 11020 bytes
SHA-256: 4b81189539b8fd72c25dffa29a4f5f436fbacc20e79f3967b5a9fe33f9fc22e9
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 17160 bytes
SHA-256: 3b03fc8bb10fb67efc285bb9614440ea5128ddb44bb707fcbfdf723f37bfd911

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