Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2d7af63103fdfe…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 20:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ba174f2458ac70f67b1f48e9b0dc0dc SHA-1: 31f8a8691f3ce1626944a6b75f3d22ecec2be669 SHA-256: 3c2d7af63103fdfe899261af6899bdfa05fc7c3e823bb5f7f726690f782e05f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=female+body+measurement+chart+pdf PDF link annotation
    • http://leebyunghun.kr/new/upload/board/files/54740239725.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/11804643634.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/97689970045.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/4562310624.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160894ddf202cf---18611962662.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/84460634194.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/te9n2h9hsi9ggmecgrder97c83/rixubowox.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/gorawojekuwuvadu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/00odbomd4eh4vqtmd7elj5mbar/zopixedulivitu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ad3d99200---rodome.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072313544134.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8a615095b860a13a0a2b6c9439e2a8ef/4821697653.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/74669524296.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612742c4ae7b0---15608497150.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fpr7gf6f325vm4bovo20574k96/devezexivubelex.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/dovonorujuxanibufodegobu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/186026586960cca1411d6e0.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8ee95efa48050061842cbb3dc5dceb6b/4417443332.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/vurokijotekoruw.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/nakadaxagapitug.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/33120587989.pdfIn PDF document text
    • http://elitacasa.it/images/file/98939929220.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8230904d---85082217721.pdfIn PDF document text
    • http://jonme.net/ckupload/files/biluwagilasikemusu.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/rabevolewaki.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/pukagazifojixu.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_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 11124 bytes
SHA-256: 5528df058794e463ccf63743f641d4bb67d8060860afcab2c96be8922ff32daf
font_01_sfnt_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 17504 bytes
SHA-256: f0209a4cc33b98971d6ea312c9b6ddf6fac6e8fbe9275bd1a4248f8c4c018fb7
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1