Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4493d5626d9958…

MALICIOUS

PDF

98.3 KB Created: 2021-09-07 23:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9e2626747786cc578403af8fc850afe9 SHA-1: 4ea03fd98c60fcadf4ebac471dd5065de73a7bd2 SHA-256: ef4493d5626d995874dd77a9f9c2d2ff60cde325c9015d8f8b9b02a66af823aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable hosting, likely to manipulate search engine results or distribute further malware. The presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bffa0aba2---13383461167.pdf In PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/35403925254.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/tefenovafasuw.pdfIn PDF document text
    • https://empresa-venta.hr/files/giwilekurawovulet.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8mp5hqercori7d437gf1dh7ku/vuzaxos.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3t8ab3v2ielsea8qqfi4hib9i5/46042735581.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160982fa4e1346---5044986087.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f52314fc---19349539204.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/kikezunerili.pdfIn PDF document text
    • http://goref.ru/files/file/64015287420.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/fipibegekewoxe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc14b42bf---botaj.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/mivuguw.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9d783ddc272b7b88ac7e78d5cbe45b35/talizi.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/fotuvuvedilisaxodigola.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/domilowot.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/zatojutus.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/33c451299c2983f1b100f6c4cb3b34c7/44711572620.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kopubuf.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/4185129697.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/1a2fea28f9cf3e7d16a1ba0ee1eb618d/98138207360.pdfIn PDF document text
    • https://activepymes.com/pub/file/mewusunog.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/tuxezekasaxorabutipap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tazeerat+pakistan+pdfPDF 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_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 10440 bytes
SHA-256: 12595ea2d83e0ad3b4807ac47684aa838b1c4ce01b41a250a180c086b54d7754
font_01_sfnt_off00013733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13733 17316 bytes
SHA-256: c4616bc3e73d6cc8dc1fafd2240ae3625b521c507ef6d5e420b27e69a92feab2
font_02_sfnt_off000163c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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