Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a09bf33f952484…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 14:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a14dbe05b0cc17b3291b1aadaa3d7fc2 SHA-1: 2a222b5d045d7e8e2c2881fa076b191329aea4e2 SHA-256: 45a09bf33f9524846e27293733679c6f799cf2d4ab5b73fff9c62ce8bed7efa8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://appartementslisa.it/an3_Uploads/file/lifetenewezajewipamirar.pdf In PDF document text
    • http://speckletrack.com/update/editor/file/15875741993.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/18694041121.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/36241524480.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/76829394753.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/mokojutomowibelenetejoz.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/1656132280.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161360f16b0a6d---potipedupivojofedunexix.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/14879721432.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/dinujuvobatopoligupas.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/savebasule.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/af66ee5268757bedc95f40146134a27b/28012473101.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/muvalisixudixibofuj.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/41623121807.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3acf0a18---julapokudowodavopedirenem.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/17701830806.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/pepexizut.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/durikomivifewelag.pdfIn PDF document text
    • https://aromamarketing.md/img/files/takudazuzegedumevuriwelaz.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/vafumosediwedibo.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/xofafeg.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/83531699846.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/danulamagemijo.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xujogagujojapakananofawuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+password+protect+free+downloadPDF 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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 18684 bytes
SHA-256: 35b4bb52c7fd2b737ef4d30b21503e9bef261b85b626f6587690c6fca522c7a6
font_01_sfnt_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 10608 bytes
SHA-256: 3f24fd86e46415ab74d2dce1e95657ea8d29c8778cd4c055b2abf863cb7fb1d5