Malicious PDF — malware analysis report

Static analysis result for SHA-256 d857bbcc6fc8a3aa…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 05:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7afc54c8d7228619482718dd9d47a855 SHA-1: f82e4b995969aca191c71951115f18a67e680727 SHA-256: d857bbcc6fc8a3aa11db11f369875df5bee77d336fc059438cf7dbd69b5a82f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to manipulate search engine results or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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://consade.com/userfiles/file/kesodudemabaxeravezaxeliz.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0oa0qnsgg838p4jnhjek5pbqhh/zajejoro.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/mutaboxove.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd8661cb66---bateneninasa.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/12178131160.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b3cc7aec---tepisazit.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16114351fbffb8---85093779604.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xonazilafenibab.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210709081453.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/16137023096.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4ef0ba8d---39897392615.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/1e584307d95cbd120fc6e665fd1fd4af/89103129700.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfce01ef4fa---45026138675.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3b98047d2724e250d745e0e2e1f3929/nerimizuzoxegumozol.pdfIn PDF document text
    • http://th-hl.com///upload/files/7232583524.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zemidixo.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/gomirokogixasituj.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/2916276233.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf3987a35---35416738465.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609103d5088a5---84576877612.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/16226102872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bachelorette+leslye+headland+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_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 19388 bytes
SHA-256: 89044ae0cdee08dd420f41758e5cf7ecf63be5d0098fbd86173968256262e792
font_01_sfnt_off00012b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 10792 bytes
SHA-256: 374e6382ed53703e6a0b8f84e5eb574791dba7fd775575453f9619f8e4d1f003
font_02_sfnt_off00014450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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