Malicious PDF — malware analysis report

Static analysis result for SHA-256 179a2d1dfa26d3ea…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 17:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6323ef20f1a7b6d302a7fe30718eecc9 SHA-1: 2429dd6ce75a650cc35b531fbc993a2b0b5e0a11 SHA-256: 179a2d1dfa26d3ea8c7ab342878bbf3cb97ad0b2f44b4105d6a5fad4b498cfe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/edd7ac36de574ad4f28733e8f548db4d/11310016068.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/xoniberal.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/nodafigajif.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f0a75af5ec77d5cf193d810579489f35/luxuvakawi.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/zalibufu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bee88074d---wuluvivarugasi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/2imkpd1arep9bg2n0o58qalsh4/rakiwilatibadamoderorizo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3999d1427---96540596517.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/5073286036.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/24003570945.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/ludasor.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084858425131---donogabavaripumegoni.pdfIn PDF document text
    • https://airshow-bg.com/file/fadebijiv.pdfIn PDF document text
    • https://kopari.hu/files/file/fodibugow.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/418c746509baf8f8566670fc848ba793/31232222346.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077094bdf50a---gewijelesuvupopaxonuzila.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/jufofuvexofepunemuxi.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/kixogul.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210508124630.pdfIn PDF document text
    • http://yejida.com/userfiles/file/28470830894.pdfIn PDF document text
    • https://negaratoto.com/contents/files/90013825215.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/66215118095.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/64643341691.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/26370623773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tutorialspoint+assembly+programming+tutorial+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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 17112 bytes
SHA-256: 7cbc84b1bd5d40c47a19497f9fcfdb089e5e23bdbbcd97546ad81de1b62e8416
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 11160 bytes
SHA-256: f1e5f653db0603a61ca1b3a3ea4da8d013cadb26ca73f2e95bf7265a886934a2
font_02_sfnt_off00012337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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