Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc8b0975fccaaa6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 11:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 560345d23ac5824d9a1f94391435b91f SHA-1: 7f86d966e5a881c26ff5336e005feb4741134560 SHA-256: 2fc8b0975fccaaa62cd82ba6c81ab0f14114f047504fcefd6b4c5ce827f13ec5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple PDF links pointing to compromised CMS uploads and disposable hosting, combined with ClamAV's detection of 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gangwonbnb.com/FileData/ckfinder/files/20210822_431C05EDCEB5205A.pdf In PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/80769779469.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/lubupuxukedonefoloreb.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a2d04ee14757cb15601873878756ee20/31637115382.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/00383c5694d9eb292efeb16f4c354809/57318180986.pdfIn PDF document text
    • http://lex.tj/img/file/wonuvivubolebuvudimowari.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/17528034229.pdfIn PDF document text
    • https://songhong.info/userfiles/file/10213344981.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nvtom2e9i6574dt1etqujri8rl/duvijapog.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/gelepapasixotemew.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/43189727001.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/86479189579.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/77732407788.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/29344060129.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/lenopaximurorifevi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xewij.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ctg4haefl14c3c8099k4dg3skn/52582440368.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/98826741392.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/20453463445.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/fekova.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7m8ptiql5rqobdnskdjs1m32n7/95901523720.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/75029753017.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3ee5ef9bf---63938568142.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/dodarakofaginefufokipen.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/botozeb.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/5690287266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cultura+egipcia+para+ni%C3%B1os+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_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 11132 bytes
SHA-256: eddc9965678c25edb54a7eba3756a155331f21bed66f8659317e42e864c05bff
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 18876 bytes
SHA-256: 9480b5f86590364273c4ea91ccfe86a27df97ff354a12ac5a40c450fb8716760
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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