Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0acb3df91d9096…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 12:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 619545ec313de36f554ca5e8eaebedd4 SHA-1: b1ef3ef48807b378e2c36047ab0bc63becbfe511 SHA-256: ed0acb3df91d909696b144217deb6cefde70c007cd51bcd827b7de8e39ff9172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=kingdom+rush+hack+download PDF link annotation
    • http://isagenixmakessense.com/ckfinder/userfiles/files/86595945042.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091105004890.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce40e5315---loxurigafasulaso.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8386c770b---95250763405.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/93477523714.pdfIn PDF document text
    • https://ratosatu.com/contents/files/41842913126.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/gebinikevobuvuju.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/3189795435.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/fokisulis.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/60892400383.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/71781948965.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/87015258304.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/safotef.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/52464730876.pdfIn PDF document text
    • https://led7.ru/file/61235563218.pdfIn PDF document text
    • https://electroagro.es/pub/files/pakomonolakobajuvuzo.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/11505714406.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/muliduzujuzufezasinowipet.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/padadatimiremivufepu.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/dovameguderapejavijo.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/45079188172.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/89202796607.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/saval.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161388a7d16367---zexebafenorazekujopawajo.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/vofefotuz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01c540727---lilekufomo.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_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 10856 bytes
SHA-256: 1b8f3f59a1247e7af0ffe000ec7316699cc5b331d8c8c110c1e02017804948c5
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 16908 bytes
SHA-256: 83d4a9cb400e9711641136f3f64db1c422a6e643a41c6cdec312bb302be337c9

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