Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d990d1b045b22c3…

MALICIOUS

PDF

91.9 KB Created: 2021-09-17 08:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 791ca77db56641df4a2e69d9cd70dba4 SHA-1: 6b0b5444502baba6218e64401abf5a607d4ed49d SHA-256: 0d990d1b045b22c309d9f9d5bb8c03401c71ea95b74e2274b235965d2dec2fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://huntic.ru/uplcv?utm_term=justice+league+snyder+cut+the+pirate+bay PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/73fb5deb6f7b3df30ccc800de56fbefe/zixip.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/jakez.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/76880153182.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2429eb94a35c2bf8ec1b05c0d4619b2/fojejevavabovunutowuzinan.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/65268936676.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/47278875619.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613708d126b36---duzolekawupeledu.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/27772129049.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/sejovibe.pdfIn PDF document text
    • http://sakem.org/userfiles/files/lajosiruzopinaxewijuv.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/84240594440.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/89910052720.pdfIn PDF document text
    • https://cecprint.com/images/file/46946421654.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xefuvadivu.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/podoxasuposajixapo.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/sajisugenubapotirapenov.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/1338034289.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/80970558298.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/2202666457.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/wijagibikebitoxajesulun.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/23155174372.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/gabetimuraritef.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jd9vslfcctboguabi9rrd0fsrv/81923124664.pdfIn PDF document text
    • http://sireny.net/share/files/wesudidamu.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_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 11016 bytes
SHA-256: ef9a8339f3eab09416e7a8d6cf231787ba7b2c79af6380cd24f895d736935566
font_01_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 19124 bytes
SHA-256: 664000974569a802b6ad3af0134d4618c4acb1557280d06481ec0a923e0f4ab7
font_02_sfnt_off00014a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1