Malicious PDF — malware analysis report

Static analysis result for SHA-256 1887f5c91f6fbb01…

MALICIOUS

PDF

85.1 KB Created: 2021-07-14 02:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4558e22a774896b21081af611131a825 SHA-1: f7a94bc4d464c7ff4d5fffe3b3e47299b2515969 SHA-256: 1887f5c91f6fbb01295e56be5e7d82f4dfa2f5a6cc9605d88a1a47335eefe9f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cdcc2f215---92615240650.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd13c5f70b---dafagosogovanux.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/40536920079.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160989b55c9782---87112334872.pdfIn PDF document text
    • http://honghuibio.com/d/files/93156942004.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/76070426220.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/908d6bbf0e0c1d34b93211df0e0ed6f9/bitotumefibegolukerepozo.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/fijixesukamuxasabetowed.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b5d90851---24626761538.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/wabuneluzofotijasopo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/lizofamejikejazovibinatu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/74qe59qeatin8gsq0vppk8u4q0/bufigesufitamokojafego.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/kfltg1s7pn4e4ene4mvneocv51/nuwof.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/60186802169.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/085ddcce744864817a67a02ebb36c12f/jimuxovelunim.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kagonovubi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/s29p4147tfpvfnpmes4thl2lam/dojun.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/h27h2os1hta10lh8mnhihobo07/logubidejituv.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b498d17ed56---podajogeposebutavota.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2ac79dab2---kewazebebirijovof.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c54970bf826---65658949073.pdfIn PDF document text
    • http://salt17.com/userfiles/files/15753894953.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dca353cdad3f096f6dcd1bb3797eb81b/94686451986.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/17744931443.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2eb042b5d9e96777b52687443532e221/68516140850.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-05/images/files/domeba.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/867c821498ee3b48e7cc14cbcb307ed0/73982654490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=simplifying+radical+expressions+calculator+with+solutionPDF 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_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 11544 bytes
SHA-256: 2b2a059ff9a871702cd88d24fe548d1822ef0e88cd4e39a01185b06e5700a197
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 17480 bytes
SHA-256: 205cc0bbbbe3b93a8548027f10aeed4a8b7d0d3015e7f0498df789e441a8bb80
font_02_sfnt_off00012e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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