Malicious PDF — malware analysis report

Static analysis result for SHA-256 051aed5e2b0da5b1…

MALICIOUS

PDF

91.9 KB Created: 2021-09-05 02:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cf4498ca1227405e1d4ba5f84629953 SHA-1: d03389300c41d9b3bbe4a0dd1418d9024a1577ff SHA-256: 051aed5e2b0da5b1ff2f49522247e841d308b99e4b7c00b990c581718735766e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://sudeoksa.org/userfiles/file/20210905081033.pdf In PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/15576030959.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qoauvkcuvq41cs0s7ga347b4ie/42236626298.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/28786478403.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e651f332---6939709231.pdfIn PDF document text
    • https://capecoralliving.com/media/file/direlim.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3ccbb7d1---kunonafusomigugefowutadaf.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/71418311462.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/56657971641.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/kogun.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xoripodowojox.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad92bb7c2---90575502026.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/memukuniluzapi.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/aba8c6d6fcbab3bdba36144a1a6c62ff/kodazaxe.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/nilagoxovixu.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/zovepajumiwitaxuxelor.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/jorodute.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/jonox.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4470a5185---29431559654.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/edrcc2dkdhd5im44dhm60c7cua/pifimajofavaxi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41703329a7---48492420491.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/natifegamugenesigimoleba.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/mavikijawexutazuga.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vldc027rpq60j1fvkd3fmq6jj7/63553030759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=philips+all+in+one+cooker+hd2237+manualPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/66559697462.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 17008 bytes
SHA-256: 7f7968e3e7985a753c09fdfc33c73b2fd610921ef568a4212fcd47bbd048be38
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 24324 bytes
SHA-256: 795151574f4ce335bd05453d6edd032c72542ae9d9d222cf68ef1631e04a9fc7
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 11216 bytes
SHA-256: 6c4ef6c9236c3efd959d8dc941708369ab4a29a77bfc320d10a6185c910540f0
font_03_sfnt_off000148d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1