Malicious PDF — malware analysis report

Static analysis result for SHA-256 41536e89a3c04ea9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 14:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecb55e9214752fd2ffb091866010c304 SHA-1: 757e50e725d7768e395eda5cabade6687058af66 SHA-256: 41536e89a3c04ea9159d201bbac28972946962c12ff6bc62004902ed97143c53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

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.
  • 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://catamma.ru/uplcv?utm_term=sweet+crossing+apk+mod PDF link annotation
    • http://leprofit.ee/cmsfile/contentfiles/8640199387.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/jexomotogagutezovatoxepa.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/pukulilipes.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c1b106a8---pizupopepubukular.pdfIn PDF document text
    • https://terracell.pt/images/file/47863771345.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/rekebodepetevojureju.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/84810814126.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/49303181626.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/lujalaleriledesopi.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/xutesexabafaneb.pdfIn PDF document text
    • https://udruga-invalida.hr/files/78253231279.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/73651086178.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/jigixobajusux.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139c59f9ab0f---64111170245.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/puvufoxulonikudesid.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/26841758682.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/17940534963.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9de1ab36---judilogisimagaga.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/jinaroxawola.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/90560955095.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/ralamipixakefujepifofiki.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/werexomolorepob.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b47f0051a---bojegigano.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_off0000bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 11064 bytes
SHA-256: 827cae78345fe4be24bd6dd10e2b1d66852ef89a61336f276175ab320d6cc80d
font_02_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 18508 bytes
SHA-256: 15c960251b9749bcf0b6e535776d1170f71c821b59c091f2d4c3629588d21e54

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