Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d92037919726ebf…

MALICIOUS

PDF

128.8 KB Created: 2021-09-05 12:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 128f4c11729ce37f15a56dc53474b85a SHA-1: 00d9b14ad9916a91e93500306b9508d0153d047f SHA-256: 8d92037919726ebf79b4d0a7885c17b74d1e7e0e4b3a205911db182e2f417c69
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is then expected to be opened with a password provided within the document itself, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://autobedrijvenindex.nl/images/uploads/76745298737.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/26p2q0kujtobh35s9qu7fvtfet/64528499119.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/945744669.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b343bb0752a---94524024979.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/44410026091.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/6d4101cf9028895a79fea5a5916a8ddb/55942397467.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xujulosujuzaduxotawo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094da94530a7---nazuwutuzavijijin.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d99e2568f7---tusomakokufapevesiwow.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ds2su1m5e01hl08p0erce8du5n/loxufugawib.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/tinavofunifurawu.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/xadaxor.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/96521889850.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c3808d3b076df8cc272c49f2a70945f9/bivegirone.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/ditetixumu.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/67812377322.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/34537358549.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8227f47fb05af945562526ba34d957f6/natipubenaxiguduroso.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/kewamop.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc48a465fe---20456229098.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/wisive.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/15887822867.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/ririfozikejuko.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af925d33f40---jawajumapuxejafuluxajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kingdom+hearts+2.5+walkthrough+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BDE 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off000183d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D6 23736 bytes
SHA-256: 1ccdbad59155c8b4a854ee07f554b48b611ebd969ee43d8de28bbaf7cac8d43c
font_02_sfnt_off0001c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D974 11536 bytes
SHA-256: c5f4ac1a4f0927298d77ab2ea71778e506bad137ecbe3c517524f405afb3f56a

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