Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4e916a8eb728c7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 17:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94d82e4adb4ee06134cdc5e6d0d91845 SHA-1: f32c29784ccdda62555b5e7907ccedb615b8229d SHA-256: 2a4e916a8eb728c7475583bad06ad8262b77c2130fb22d86e2a0af9d1bbd5383
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the nature of the URLs indicate it is likely a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393221429c4---40323210770.pdf In PDF document text
    • http://meditopthailand.com/file/80640757317.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/zivopomedexibarelotusaf.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///27340080212.pdfIn PDF document text
    • https://egca.fr/userfiles/file/dekif.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d5eba8fe1a10a114a403f7a8af562db0/73789863300.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_A630D8712A0E4B96.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/77292756329.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/88117245622.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/tabibegumet.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613148b9c2f73---67669809051.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tibepuzatupokigimowegon.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/daboxejebimapisirev.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/57672250406.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/92002288763.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/58349677683.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/fewunixoloseluradi.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/92176869670.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/sawomobizedevofasezezedad.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/af7956bc9bc860875ae8591cacdebd88/70584880083.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/xigejere.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/16899748721.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/29181827250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ld+player+controller+supportPDF 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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 10588 bytes
SHA-256: 7901776fbe175cdb8c6e4a68e0ebed93a26f5fd5bfa155cb691c54a3ce34219b
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 16988 bytes
SHA-256: e66389ad07e01540a08363d59ae614064aa87afff5559d9e3080a5da61350f50

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