Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74784414be632e8…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 15:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2be5072d0792d32da6c53fff353fb825 SHA-1: 56b502cbf8599aa6f948720a322204aa1017ca4f SHA-256: c74784414be632e85510137b09598aa1f98e8e6fbe52d74aaefb72ef0919ca25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=data+structures+and+algorithms+cheat+sheet+pdf PDF link annotation
    • https://i-intelli.com/ckfinder/userfiles/files/zuxukusa.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/xoxosamot.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/62344549068.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/migosiwakuromisolanevel.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/57843845807.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/44215559488.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/58149791807.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/28114794196.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/romaxow.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/9072909276.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/27696885412.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/75128434002.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/rojavi.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/tapuku.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/429c60d4d3fe20f09e12f115f85d337e/68135764290.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210919063349939129.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613078c15558d---zarajinijapafawoga.pdfIn PDF document text
    • http://vswet.ru/f/ganawatoxapavaponapop.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/dafuxuzada.pdfIn PDF document text
    • https://manenshop.com/upload/files/42187985904.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/dimow.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/165a0d3933041fed1b07d65e15244e3a/97662820719.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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 11168 bytes
SHA-256: 6765478776d7e7c91a5e91e901f2be7c288c831cee58fa6cc88d51a79ad0d36d
font_01_sfnt_off0000cd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD97 17900 bytes
SHA-256: 6d736732ac39766df45dec8501c57d705c7e9544df6153d48f8efe92cdbc879e
font_02_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1