Malicious PDF — malware analysis report

Static analysis result for SHA-256 6469ed3a1ff3837d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 05:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76f5e2f7af5813fe7ac1126e1ff75f63 SHA-1: adacb034273c1a71b159351b8cbf5334aa5e8074 SHA-256: 6469ed3a1ff3837d1453a6c25ffe824c859111365bc32ac4475014316d1c31b4
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and Trojan activity. It contains embedded JavaScript and numerous URLs, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://dsacare.com/admin/uploads/file/45081564485.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613E863B1055A.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/pikilotalopugel.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_9F167FD470961435.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/67680124566.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/76501081224.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wegumusuwizikuwawagiwego.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/losapuvowu.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/69558211914.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/63117313189.pdfIn PDF document text
    • https://csodamalom.hu/files/files/zeroz.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/labozuraje.pdfIn PDF document text
    • https://aromamarketing.md/img/files/74663288206.pdfIn PDF document text
    • http://saktigroup.in/uploads/92678781901.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/oqblj8duei0lamvjbtr50np0kk/lusatarejeweluxevifivedi.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/32760994515.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/17625777663.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h3c70hsq6ppt3m3jnn0clj6r91/rafogikovinusoputa.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/ferex.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/kafaji.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/zifaxunawirezubutevu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142565dcc907---32880282281.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614261e0a5f3e---puluzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=games+with+high+graphics+for+androidPDF 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_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 16696 bytes
SHA-256: 891a327091b252283392865d35e8264899befff008a88b8945e755a7f64a47da
font_01_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 11144 bytes
SHA-256: 36a6eea01d770a78298813b583c74c31327ffc9ecd86ba89687d5489c2d1ad98

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