Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa24800b04b18da…

MALICIOUS

PDF

70.4 KB Created: 2021-09-20 13:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bca9bac4ba188cd9afe4ab25082ccd16 SHA-1: ae2c50d6076b3e2e0240fc0d364e9cae5120e5f8 SHA-256: 9aa24800b04b18daae655ea38c9c259e3aa75813ded310a074ac4158b3d18ab9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://alhouti.com/userfiles/file/nalubulusozanapevuvejik.pdf In PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/94144597002.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/93428042883.pdfIn PDF document text
    • https://fivetc.net/uploads/files/69344478370.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9eb3850538b0267c8ad0180ce21de3a3/35159624902.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/pufexizudujuxowopupuna.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16146a9f8a81aa---pirijip.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/dolakilovebi.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/sifisozapuvigadetoji.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/3056740932.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144d8b0d6480---78784378686.pdfIn PDF document text
    • https://fond.ru/userfiles/file/4211686961.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/18048312409.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/6084112114.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/60003122507.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/femobexupabunolebo.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/8391568891.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/dubudugafexej.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/digesin.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/99546770842.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kqjsa9fq9rg0b7fepkdk7th15t/vobutixuket.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/42016588785.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zakagurofezux.pdfIn PDF document text
    • http://dgkno.cn/upload/duvusalikodudap.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/4fabc1bd55938aa085b7b1545e3092a5/36258754512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gmail+widgets+androidPDF 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_off0000b5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 10716 bytes
SHA-256: de3bde0992ac41c42ea894241906424d9546b15c937bceb50f7ec9e83cbda7c6
font_02_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 15000 bytes
SHA-256: 4f36b28f94336a081c15629a18e4ffc3f3bbd642f3e4dcd346f7e271fa99c068