Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b19dabdb6abcd20…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 14:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87c956bc1c1f31860d359d594caa5678 SHA-1: 848ce0f7dbce9dc452ef4695f2176f5361e555a4 SHA-256: 4b19dabdb6abcd20ae6760aebb39afbf182e5ce1b8e10831a5ed4670d94ef80c
136 Risk Score

Malware Insights

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

The sample is a PDF document that employs social engineering tactics, specifically a 'Browser extension / update installation lure', to deceive users. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://philabc.ru/uplcv?utm_term=best+all+file+reader+for+android PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/12641877121.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/pukitixavil.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/99250258682.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1cc04ca94---69037202722.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/68471058918.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/xusutu.pdfIn PDF document text
    • http://lex.tj/img/file/sodiluvavip.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/62365788966.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613977c60a29b.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/67247020218.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/bexodomed.pdfIn PDF document text
    • https://bor-diing.com/upload/files/nelelilotixuvezune.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/73403959097.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/32128948561.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/tedajitopavalap.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/mazegotudipajogatiru.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/71852827399.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5474edbb---misudafediso.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/93381290644.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/rejaka.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/gexasotadeji.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/45049487994.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b7a0ffc4172437d6966033a525721c8c/runamuwifasuful.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 10400 bytes
SHA-256: 361e2f6c985822c4ac79e140792af526328508b701feb28af77463e02c145619
font_01_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 18592 bytes
SHA-256: b59e39c72b539ad1bc2242b302e2f1d1b9661ddea253d79f9912b4fd9d14de73
font_02_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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