Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9525f7d2bdeb21b…

MALICIOUS

PDF

98.3 KB Created: 2021-09-19 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4de55bf06dcc96270fb9c7a159114a7f SHA-1: c3b4925c9fb19a6ba196079f11912148b816a40e SHA-256: a9525f7d2bdeb21b5e70d3e2982df7b6b3a493cd93c8ab7e03e9726fed305af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://nomylo.ru/uplcv?utm_term=8+ball+pool+free+chips PDF link annotation
    • http://cbgnfinance.com/userfiles/file/97442575529.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/37223008136.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/20957836455.pdfIn PDF document text
    • http://apicn.net/upload/files/80665501388.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/futilewulobemekew.pdfIn PDF document text
    • http://domplus.su/userfiles/files/23908341964.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/rujorapedasopeminevonu.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/duvigosikizudunu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/4613695483.pdfIn PDF document text
    • http://annabarons.lv/files/files/vovewom.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dpaeun5itg7hocfcuch5dq2qd1/20445259857.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/xizikiwe.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/75945399598.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fltbj3haiel54m54l265q6df8j/32773042770.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/wefigut.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/75003428595.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/dedijedozat.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/11219394544.pdfIn PDF document text
    • http://3sdent.com/upload/files/55583629954.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e5813ae74---73224579923.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210901063430.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/83312855016.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/63654942284.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/75340370385.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/zikewile.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614751f97a1b0---3755536569.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_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 19276 bytes
SHA-256: 8b79962470d8a13f11aba225709dfc35199847850806301947f2515c2095c3de
font_01_sfnt_off000149eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16202 10624 bytes
SHA-256: 2183a561ce54a1664e6b510cde60a794dd41119f914328b2b106c4a553a2a2bd

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