Malicious PDF — malware analysis report

Static analysis result for SHA-256 6648fcb77e95fe8d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 05:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b17effe5273ae6876b047b9fd42d72e SHA-1: faad43c440a2a05bd37ca643b361dc206e4c3487 SHA-256: 6648fcb77e95fe8d3bef6c83ec7eba3658cf32526d683fd715f2bf27cc095c12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous links pointing to compromised WordPress sites and disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download process, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://remproekt-m.ru/admin/ckfinder/userfiles/files/karekobevurujixapalapiz.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161388c4d1f0e4---48315838411.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qfguin9t1k2m0g9fcunh04j682/neribasatugedogoga.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/bugud.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/52551995455.pdfIn PDF document text
    • http://kelvista.lt/images/files/34486748500.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/wegurovajusine.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/10339463758.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/58769566541.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_3A39D2217FF74366.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/bamozidox.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/temelavetegaja.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/40907524319.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/7750628907.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/pupasibum.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/xijiv.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/mekijezeveto.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/75173175650.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wasezigoniwalosugeve.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/jidutaseradogesowa.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210902002141859.pdfIn PDF document text
    • http://cochemical.com/upload/files/20114126528.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/duzirapukopekaw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68e690710---43074621769.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/gijomivuzefezomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+shadow+fight+3+hack+versionPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/fubuzerifalokuporoxumuves.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 17624 bytes
SHA-256: 1d62888af787e2782aae1910f670e71a65ba49a114b1814acb4d8910d0d6ebbe
font_02_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 11172 bytes
SHA-256: 4430065ba192eb84e8001d146965afd1c27c2e24dbeab5d65b2330aad42c607b

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