Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1be32cce3bc3ba5…

MALICIOUS

PDF

89.7 KB Created: 2021-09-14 01:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 341cbd196bccb0276912afd0a258276d SHA-1: 9bf569d103136d0dcb60df7b6f06433c96847e8d SHA-256: a1be32cce3bc3ba54953f195379f038980065da86ce7c0a780b3d71afc9d12b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://suavitinhtannha.net/upload/files/ravoj.pdf In PDF document text
    • https://masihpt1.com/contents/files/54654533105.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zixuni.pdfIn PDF document text
    • http://digifast.cz/userfiles/sewaxoparoj.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/dakijuvumozebexe.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/tejixajugeka.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/17964547174.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/48938015018.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9912a8b4---wofuvivisido.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/23665414887.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135385259a41---ximifewajisanezap.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/puxiziwexubifulu.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210904101318017.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9602f1a856605295746b3ddfe47b68c6/lusoxem.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/61123697662.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/lifupuzowapuxeralusito.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/57787681767.pdfIn PDF document text
    • https://bem-sa.com/img/file/30032204121.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/62225200538.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210910030353595966.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/98494826733.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/lodekuwosuzamivu.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/rimuretef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dragon+warrior+strategy+guide+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/suvusajupelawomixun.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_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 18080 bytes
SHA-256: 271fbf89dea97e0c80900bf6b8cb13e4b710bb0f848650695d4b7a0af3bed63e
font_01_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 10928 bytes
SHA-256: 49389de23747d2307a03bf3cc40cfc40df22cfb3bc3ca9d3149abed1c7686d8a
font_02_sfnt_off00014171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1