Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d599b2d68533c88…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 15:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a53cfc5c87f04dc440648e154eed05e1 SHA-1: 2bb1b01a6643959a23940b7eee84c2fcbd42ec04 SHA-256: 8d599b2d68533c88a3a1092ceb9d5732af680050e654cc7b4b1f041ff0f5bcb0
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/03a5541b233f0f8b2ee4d761485f45f8/kigamuvuxumogibunipiwi.pdf In PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/bebabezurijison.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/62815746221.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/wekotase.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/445f587f7358fe6062e9fad31a8c43ad/5163281274.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/kizejegunuwunedupewe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a31721a052e---serogekokibosikigabiwed.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kfi8u1ug5al2dp54gkc5rqtkt3/xolinarenefokifaroteguzo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acf3e2e9498---64812558692.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160799ed038fbb---34964852685.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16085806af042a---tudaturegiginotuko.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/gelesizipetarizo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096e149a511c---65666733808.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210709_043536.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132a18a2b8c2---buxepeno.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/poluroxej.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/nanalomuxipoxurogejew.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/gevenelibefofon.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/4982837495.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea6ac78ce---1545298200.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1145d54b39c010c2a6bead9524700ed3/23175538047.pdfIn PDF document text
    • http://sbcnepal.com/images/file/xesilowas.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/muvukanerufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=management+and+organisational+behaviour+pdf+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_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 11332 bytes
SHA-256: 4f5b2ab0930af36b1858284aea578c01541191750cda7f3dc85a2aa7fbb7eed1
font_02_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 18844 bytes
SHA-256: 51d04602c5bfa14cef4e7c2d7907b9fedee2dd2b77b399c5dce03d6834688097

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