Malicious PDF — malware analysis report

Static analysis result for SHA-256 6857d655d1a618ec…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 05:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2116db74a109e21028e5f92709c690af SHA-1: 8adb60c44f96744a9ca31c8189782b8131218d47 SHA-256: 6857d655d1a618ecf498d90871b7fb43bb0f2e355045592c033fa64441fd0ba9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://pixomot.ru/uplcv?utm_term=allotropic+forms+of+hydrogen PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abaac0897c7---88365976925.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/gl6un97ag9bmssm27tlo3p5cos/23491097536.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/35889997566.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/10063294203.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610fade9c432e---64224054266.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/wozolulapilusazo.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/pifivejakovenoxep.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/kazebeliluxe.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/weropirixamerejujug.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lefawovejuxe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/co838177png00cgqfqh2npsmii/93055029279.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/71146404044.pdfIn PDF document text
    • https://digireg.com/upload/44201533874.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/medewutedugimategoxov.pdfIn PDF document text
    • https://rajakedua.com/contents//files/10347150979.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72c59b880---35853511381.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/20376898562.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d497c68989---81288817892.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/67652865917.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/nofag.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b335a0976f---jedejikujetuzipazofud.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/30363184550.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/penopadijemapax.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/24040356620.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096594a8df8a---13173506002.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/vibopexotonolatusewiji.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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 18188 bytes
SHA-256: 7be7e77fb84df2a984a4c59403b78902e7a504f4fd30076b2db1ebfaa98a7394
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 11000 bytes
SHA-256: 2d8d4afb72490fb02cdbfda48dbdeeaf48518acc603c162c3ca9fadebe3152e8

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