Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77d19f846c3747e…

MALICIOUS

PDF

78.6 KB Created: 2021-06-20 05:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 028c05ccfd32322aaa6dac7a5db2fd91 SHA-1: e6c2e76da7754155f6b50cd42225c546f2a6f725 SHA-256: f77d19f846c3747e80b454968d4a993b025f31bc4682061e4801a27ff9499d69
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_FAKE_CAPTCHA' indicates the document presents a fake CAPTCHA to deceive users, a common social engineering tactic. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content or download further stages. While no scripts were directly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://cissud.eu/uploads/ck_editor/files/rurasonuwibokawozexatemu.pdf In PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a1d59573---99429530297.pdfIn PDF document text
    • http://bwc.lt/i/vonurulorexasawopox.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d98d35055e0e6488a7ab65432526adb5/maganakodufo.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/moluzufinepukaja.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/44885625686.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089e11db8c84---wipagulakojafunimure.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095d470c2084---70639927273.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf7717f8f---98885975094.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/ninunu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08f9cbd9b---84756779030.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ceib9ru5kq8clmlafaptaf8fb4/wetolabomezezafoketisup.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d6164cc8---sefuvuxudu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/86425fb82f8bc44007929162ac9394a0/86910579696.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/44514876515.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1cb53ebd4---dutip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=plants+vs+zombies+garden+warfare+apk+androidPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 5768 bytes
SHA-256: 147a73b7fa801aa346fd81af2956c54970fc59106be3c1bcc5876e5d94b8d60f
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 22036 bytes
SHA-256: bb427b8664bbfaf99935a8737870c6ca57a91122ecbad95f322de1ac374617a3

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