Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3a9bde4265c6a0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 13:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 437e6b06f7b2467aafb2d4fb43399d2f SHA-1: 9e2412b4aeb3215fd4cf6faf27382e5449300bca SHA-256: 5a3a9bde4265c6a0ed510e4d5fab90efdb16dca07ed3a7101cb90e32f19391d1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing software, a common social-engineering tactic. The embedded JavaScript likely facilitates this lure by executing malicious code or redirecting the user to a compromised site to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e7c0403f---vigifemulubirekur.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5aclvi4f011bkmg7h0fp1uv182/47047946364.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90584bdb1---65339766572.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/kirew.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c408c524e8---baxuwilawesaxozulamowas.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/valikoxi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/58c11a60e374a3a339ffafe3122769d9/japap.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2a7168d1---pujisuxibozizobupera.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/8574497920.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/89368895534.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/vutoxajamuxod.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/xoputipugurisulasip.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf59e5b53c---banivi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3831b9a1b4---60504060619.pdfIn PDF document text
    • https://ijp2.com/contents//files/88321242725.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/90768096405.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/99457238381.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/dabopevugapitor.pdfIn PDF document text
    • https://pindimana.in/uploads/file/10581963233.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/40401243894.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/loduvurazuresalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=append+to+string+array+c%23PDF 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_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 17972 bytes
SHA-256: e252e8f86bcf15dde8127f3b6fb3c6adcbe029c298e39d829a4b37b17a19264c
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 10740 bytes
SHA-256: 9dbf2397ef72a3f997bfcd85007ec49847d9bdecd2a8b0e39332a2c4ef7490fa

Open this report in the interactive analyzer, or submit your own file for analysis.