Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6db477904386e40…

MALICIOUS

PDF

88.7 KB Created: 2021-07-26 12:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fa2070df79d414c525228acad2ff60f SHA-1: 509124bd0a626bdcac0261f677585a636ba1305f SHA-256: f6db477904386e402dd83e9170144ce393b672578e8174bdc955a4814713c9d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bagumul.com/file_upload/spaw_upload/file/20210608053031.pdf In PDF document text
    • http://kulturazebrak.cz/userfiles/fudame.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/prv3gb379a2hnath20p8s9hqk7/jesetaladufazidagu.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/46629475096.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/58540626073.pdfIn PDF document text
    • https://termofriz.rs//files/rizusozupodekozex.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83731649c---88432802998.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/974824c8979cfc649c6a2c532baaff13/38878895994.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n35jlssepj70bs8hfsvqfa9jt0/73001066920.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qq633efeknkogj6er2mb4pke36/pujedufurikobaga.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6491c46c32db6ec311f24c552f62dc3b/gofomipoga.pdfIn PDF document text
    • http://placc.info/up_image/kojareredo.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/pezilurakomewexijipalal.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/linifubikulovo.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722df54905c---30655859799.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0d1f2323---josirazut.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d8b20da5e---23404263761.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/kimamovusuxelig.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096a50ceecc1---rujivezuwobesunezakom.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/92601930576.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/mezadarukeju.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/76115985367.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca55b2b6c2.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/kukusagagerodudote.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d5f5045c---tovafisinawimabibuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+a+capability+needs+statementPDF 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_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 10804 bytes
SHA-256: 263884ae5c145f4a63796593ea31024d12eeab665d7a42bd6719584faad05cf6
font_02_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 16568 bytes
SHA-256: 9f3b613d6989b579171e0034186e453d59b5b9cc599cfedba78a0049c3304f09