Malicious PDF — malware analysis report

Static analysis result for SHA-256 86228cd548f14e4e…

MALICIOUS

PDF

83.6 KB Created: 2021-08-19 19:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d0e4f3282688299aa8e4b421c24bc05 SHA-1: dea727d93b3452b6b9d6a85867ba4659c309a047 SHA-256: 86228cd548f14e4e6c70c3eaacc6312fd4f3b31c73f236b98763110ccee62702
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external resources, potentially for phishing or malware downloads, rather than delivering content directly within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://recko.ru/ckfinder/userfiles/files/tudejalubovosagik.pdf In PDF document text
    • http://tpokebar.com/uploads/files/fuwikezamiwatut.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/3ik76ghrpo3nfg9u73kae1knip/46160362370.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///tapinimatika.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d75de4a8f---xigegozunutepe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb7a732ca---77641021539.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/398842221fca4c586f6abd6b08b54b9b/bufituma.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0f6623a3---nojerarut.pdfIn PDF document text
    • http://abpaluso.com/upload/file/88761410325.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6529681b0---poluwuw.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/letikek.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/48972800897.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/84d08b057ff0b1ad13a9a3e9aca49c89/24037131305.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zazimizopelobevofok.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/59026724665.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611731895bf3f---21357659360.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/24676672769.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/24c1cf7608c26292ee55e411646a8b91/diketasug.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210709105004.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/mofufulag.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856a75ebd36---61069749829.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/jenazizu.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/xijivixefifik.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/zepujajadogiduzureremoro.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a19a651f---buletoxetixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=baixar+musica+do+youtube+mp3+pcPDF 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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 11204 bytes
SHA-256: a0586f74e0bbaf7073f90a1d03b47e4b23f3056a26b0375f52b2b62b91358d79
font_02_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 17636 bytes
SHA-256: 6936896653d6fe8142440eff7b1ee20d57ac787d30554b7fdf54fb866c16ddbb

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