Malicious PDF — malware analysis report

Static analysis result for SHA-256 94423487de976aa0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 15:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eb0ee5d3418deadf2646ae5ae9ee97f SHA-1: be5cf120add2203a47b2e5e88f8e21c5d94c2a65 SHA-256: 94423487de976aa09725ca924fa6ad666f079f3b50c060f8547c7c1c39458acf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous links to external resources, many of which point to compromised WordPress installations, suggesting an attempt to host malicious content. The primary attack pattern involves luring the user to these external links, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e59bf51c---fejul.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ri6pvi7f775fsbufnfumabsrf6/54474443462.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/65483244454.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/newexidogijarujedatumine.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/91078494372.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/30738051037.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087abfc66cff---bexosepufaxotipas.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16087747e63cbe---pajojama.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/75916556369.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3oinpc0fihv86ekr12onmndnev/76891404930.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc86f2c292---wipojezo.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/ganekemituwopisoves.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc31a5e59a---jadelabuko.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ff2c68a7---62496985791.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/73123342241.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zapefuli.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/fogugi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d55eefbb2---55476507481.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/mbur4seeotdp4obgn8vtvdnsbr/8065841338.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a5d0e00c---fufodiwuze.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/dbdacc75742c5b57e017b99365853b9e/55678675743.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/83655388851.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f24becdf3c07f537218c88cdf7bb7112/54238409107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=disable+spelling+check+in+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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 10812 bytes
SHA-256: 228372a4a5a41a7a3ca1c1efc89002c41599f80cab5ab2e7b2aff7b8407a6897
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 18060 bytes
SHA-256: 43c3343b7a44911e20523121cf0e10a7ccada58e69234cdef9c0e8516722c205

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