Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b7634e00e11b41…

MALICIOUS

PDF

91.9 KB Created: 2021-08-06 20:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d9ae763cf74ace4b25eefcf08118d01 SHA-1: 7a9e8139ebd474e9e2541f2c40500a86b2d9d7e8 SHA-256: 94b7634e00e11b41af93c3e04bc13a75e8cec99b5aa5183e97d020ba0ba59c14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The numerous embedded URLs suggest the primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://nomylo.ru/uplcv?utm_term=when+should+the+timing+belt+be+changed+on+an+audi+a3+tdi
    • http://curry-box-deluxe.de/userfiles/file/judurixuvanebab.pdf
    • http://www.findvoters.com/userfiles/file/15824686616.pdf
    • http://safeabortionnepal.com/userfiles/file/13457265991.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/nagarategebebo.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/25263535770.pdf
    • https://alnahamgroup.com/userfiles/file/xiremufegabozojuxo.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc11695f206---16547730057.pdf
    • https://rocksoliddesigns.biz/userfiles/file/62351799240.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9451dff6aaae3f2022ee4351b984e7f2/wapupugijowe.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/zagiwulikofojavuf.pdf
    • http://lawrence-spruill.com/clients/42275/File/65309169520.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/nobuvefizerevevezapodoje.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8fe184e2d---desegisitobeno.pdf
    • http://aeronautike.com/userfiles/file/dunukufisedideligapoko.pdf
    • http://jjkxmy.com/upload/files/202107081147324794.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/31cbe44b116a45b98a338a4737c3cd0c/17355042017.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3155d352fd---83743933084.pdf
    • http://ciskmv.com/css/file/40011301110.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/41242a5612c496ccd29bee907d512657/fafudametikimijoxotomaxu.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b13dce47---kawenofebepuwovusolazujap.pdf
    • http://www.wiz-fac.com/uploadImg/file/guwosekumezep.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/64e80ede871ac862914c0785d3dea9c4/61059860913.pdf
    • https://aksusu.com/upload/files/fubuwimiletugufuveji.pdf
    • https://lesfeesdelhetre.fr/upload/files/51749212682.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c2.bin
3e877adc19b31725502f7c3c307a6c6b9efd6d11eafdacf3e8e9d90d71ffa34d
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16688 bytes
font_01_sfnt_off00012f33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 16792 bytes
font_02_sfnt_off0001474a.bin
f7a93847e94e61ae76e0030bf8d4cd627752691e51f753793ec73a4b5f51bd07
pdf-font-stream PDF embedded font (sfnt) at offset 0x1474A 11120 bytes