Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c79a295ecbfe367…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 10:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 39f0be317d4b336da21f3c44168678e6 SHA-1: 2e02952ed3f8ee8309f3135cc62efe7f49ec6c8f SHA-256: 3c79a295ecbfe367689d1afd55ba03cdfb60444924ce808c2d1e2659eca7414d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. Embedded JavaScript was also detected, which could be used to facilitate malicious redirects or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=bus+simulator+id+mods PDF link annotation
    • http://cbcom.eu/ressource/site-image/files/79405432815.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/xozake.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614955a757da1---gubibubezokataremujiguf.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/fibozajoxonolaz.pdfIn PDF document text
    • http://katela.net/userData/board/file/melijagus.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b267f7a73ebe5e0396c547e1e133ea1c/dumutidunovisepisonemawaf.pdfIn PDF document text
    • http://maidichike.com/upload/files/fumutasodivemawibifejel.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/fipetimuv.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161465e7e7eb51---39517094619.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/34164411342.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/sukin.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/sazipiwujuza.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/60899316241.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/tizewitafagamafug.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/zavaseke.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614250399adca---44969340921.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6514b9ecb---32161067324.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/midibopejefapawulusixire.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-19-47-37-87.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/775eu3smdh452d8esmajbdf12b/dejuv.pdfIn PDF document text
    • https://negaratoto.com/contents/files/ronufu.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_off0000ad95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD95 16552 bytes
SHA-256: 493f668754dc7920fcb29133fd7f01326965a81e9a32a098f2473d30253a744c
font_01_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10324 bytes
SHA-256: 45588b0c5c6ef3c5a5836bd59fd50b4ed008219afce025e6beee76a5fc2e79fc

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