Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86d09e45a1dfe46…

MALICIOUS

PDF

117.6 KB Created: 2021-06-26 19:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e5af82e965159bd007354b6077e84c0f SHA-1: cf7d3464aeff6111f2051f93f87a0472688e04ab SHA-256: c86d09e45a1dfe4675c5e55e6fbb2fad509c56e46b47007af4c810594b2c87cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sportgalaktik.sk/userfiles/file/23721070110.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/0sqdb68mssidnvt6p59j42dkgb/sekuv.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/59385553642.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/90196902279.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ziwuxovafasovusezoro.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609293fbe9847---80085299936.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/62873346948.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c602ac295---gubojexewuvoduxudukuven.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/56289356669.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501050850223208.pdfIn PDF document text
    • http://wenxuezj.com/images/File/suvebukawixivavadob.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/riguje.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/14581873092.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2881143771---11564676186.pdfIn PDF document text
    • http://placc.info/up_image/wisabisija.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/zegufeduvefovaxemon.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8528558f47---kixax.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7583d503---miwawuxo.pdfIn PDF document text
    • http://jucal.es/images/file/60705016423.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8e779f292---rajuzelurozavew.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6c0d474801fd19c9fcfc2cfcdd065e51/rifakitudotovebar.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/vamagexit.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/kuuriqul6f11hle08nqrlnpdpn/migumonobuminowujikigesef.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ebf48a2c---kolugakitil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bloons+td+6+daily+challengePDF 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_off000167a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A9 10884 bytes
SHA-256: bf7d215b517f57958bc593a4380aba6977f3de6bed4d59c6357e3d339d35aae6
font_01_sfnt_off000180aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000198bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198BC 18124 bytes
SHA-256: 3223f8b15da08ed0ddb6cb304e2164403072a5b21007b307d4a3fa6c5c0aa8bb