Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfdba5733740c26…

MALICIOUS

PDF

94.8 KB Created: 2021-07-02 23:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c585d653df3d37d8c737f41a8f5b81f6 SHA-1: a09fb44466bf01a490ae99149f5ef0547b768ee5 SHA-256: 3dfdba5733740c26df94e3e832e8a9cfaa7313b389fdbc1b4b0a84a070146463
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, several of which are hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver a second-stage payload. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c23fcb2429b---54058391836.pdf In PDF document text
    • https://mps-india.com/userfiles/files/falavusubibobunowesaso.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/73920611630.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0af78d7d9---jepati.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/89a7c477f44a44be5da6fda978350cea/9841592494.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/17555059516.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ur8l63bkgoieucsjqeg93t3800/jobidumijafufogafofur.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/33181601973.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607652dd9f52b---depepezanawikeguganuko.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8278046131---87502680486.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/98321863380.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nimaki.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfaf0f075---53585759942.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28059b9a1---soduxugazax.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900c8de50da---bagavugotuf.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/bd608e1c820db9e38f98be4b849faaba/laronosalen.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/57197774d1bce14949f8c3a00740de47/dowudoweruxideguwubedab.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/kivoweje.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084671e8527d---51186637739.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fifonirelilikuzadigizumuf.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/gebisiwipewaxegelo.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/bokegexotarurozuni.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd96cbc61a---xatuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=application+of+gis+in+natural+resource+management+pdfPDF 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_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 17328 bytes
SHA-256: ef17428617cdcdd2f3ef5e40dcacf51f89c08169353336a5b54655c6cf9ba8b4
font_01_sfnt_off00013bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F1 11044 bytes
SHA-256: f5d44277bf8d9cec868db13dfa0d443b64840ab15c62679d69641db84ff7f9d8

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