Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa6b1dbd966806c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 10:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 197fdbd1ba1eaa27ddb3e2e3a2cb64cf SHA-1: 6853816c57fd3562374249b1915a14b1a47043f7 SHA-256: caa6b1dbd966806c5d378e5f569db4a5190b8aa6a6a8b7898eddf724d594944e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials by impersonating multi-factor authentication prompts. The embedded URLs point to various compromised or disposable hosting sites, likely serving as landing pages for phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://catamma.ru/uplcv?utm_term=android+read+sms PDF link annotation
    • https://www.seblocation.com/ckfinder/userfiles/files/pedasulebijosozokufemik.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/vebifapovilinesagesuba.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/pusefawanojer.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/72946516954.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/7990641972.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/mijetadesojoforevamino.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/31014149343.pdfIn PDF document text
    • http://w-mill.jp/images/file/vowoxasegexizer.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/kewidinemikiduze.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/71679102590.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/ratisitaromiz.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/dedut.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/80508837539.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/5858332861.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/39243699713.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144293f713df---61126025077.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/vuxipovidowofebudurisevaf.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1d31247685a30d675a099f044909f73a/rixofevutigofuzo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tv2ri9ss820taq806g2uttrgro/49878252482.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/jinuzarenubajo.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/masovotatisabemoveki.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/61611016500.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/45941391863.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/wefunitenukepe.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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 18060 bytes
SHA-256: c1f1137e3ce7ae8158cf3940e9fdbe7ad67858392dde5eda0a569024cdfcc9c8
font_01_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308B 10248 bytes
SHA-256: 986896089f355deb9dee1e303c9522189902dab7ec748e77292e3d3c4f3a29b7

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