Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd48b945026c806…

MALICIOUS

PDF

72.8 KB Created: 2021-07-25 04:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85a5ca92081de0c24ea55b58943a6521 SHA-1: 3e5e1b5404105a61bbb2e314e371367bcc37d088 SHA-256: 8dd48b945026c806e6f39829fb5b721448e7055d54ae79511a124b677cb4728c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by a machine learning classifier and ClamAV, which detected it as 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160809f04e7c11---manimur.pdf In PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/41d968a63d1bce92dcc43266dc8dc733/92959769398.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/64472835607ab17a2c04c207b2db1532/luvuvininadopoxamimuwewo.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/55904973950.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-19/20210719014915182007.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095edcb1bc8c---49958508201.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/10024189726.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f4243d8b5---35513088747.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/rusasevadutatinavuwejap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cac310f8a---51303766562.pdfIn PDF document text
    • https://ka-base.no/images_content/file/koporimosu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098768a01edb---resijuk.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/91186160831.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bd512b04f3819d6244b9409877a78187/gagefafikidufuxidelifobi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/649d49a78c8e19dc1693178de07f9bd4.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa44189737---miduwenunezumew.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/3023041576.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/fisolerabevomebipikejax.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16094908ea47a7---vowekopowerubizupanev.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a0c60f5373ef64a287e4d9a228573217/dezowetujevuzofap.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/60973782123.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/abc36d74f5e8852c6bcd2005aa1d6cec/subuzomedesaxewukul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jhene+aiko+sativa+video+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_off0000b8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EC 10480 bytes
SHA-256: 9d9485c27019b7b8732e7f5ad15efaedfad9b97d88c82fcfa0a8f751316db4c1
font_01_sfnt_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 16760 bytes
SHA-256: 850327e4e2262dcc20827d87d3efad843bb95d35cab2012416fa94970f3748a7

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