Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f405072d335485…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 14:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a3afca23bf6de4bd2be01f19c8751d9 SHA-1: 8cce13b40e2ad82dc89f82263642fd4c11fe9c97 SHA-256: d4f405072d3354855907e7abeacab2f1a8198c5325981ab0f9a0bb76e17c1662
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites, likely to facilitate phishing or malware distribution. The presence of multiple links on disposable or compromised hosting further supports its role as a malicious distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://thaihotelsale.com/FileData/ckfinder/files/20210902_777EA4BE5ECD9062.pdf In PDF document text
    • https://matfreklam.com/calisma2/files/uploads/53394591358.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/amii894o11m0l76d10fjq9te63/34269065202.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/vemesuvexexibipefil.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1d2faa836bfd21176091246c38b48c28/kogixexunamibakawinebom.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/xuzovulisubatiwer.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/84038117973.pdfIn PDF document text
    • http://retrofotr.cz/files/file/povigebu.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/dumekajetuvanos.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/733567900.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2e862e5d5f12a9751f75a7bd04b9e654/jofixepanem.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e0f0b3fe---75514994387.pdfIn PDF document text
    • https://equalland.com/uploads/File/85229857106.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b5e465f83cb38ce9e64ce2b2af63f297/togifuwobapuzixorilat.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3606_20210907131545.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/rolef.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pixejinarazap.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/jivufilavi.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/72643478956.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397ef49702a---55044517101.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/61404024054.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vejamonaxigexupesekap.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/81908816251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=soresu+lightsaber+formPDF 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_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 18752 bytes
SHA-256: bca7f11feebff16d886067baafe6bfb05152fdda8744f14f89b50b920d6a4550
font_01_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001332b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 10872 bytes
SHA-256: eb16100bc50e87438cfba5133fc5b45bcdbb576fcbceeffbfb7dff955edd8b2b

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