Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbdd56564a0d89c…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 14:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8c07c2e4afd42b8dc488008f56162f5 SHA-1: a28f1f854251d9641bee24ebb9e7a5bf1e130223 SHA-256: efbdd56564a0d89cc4c46067dbaaab4e71b14563bdddab5c576b7d6ac5a18046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the presence of PDF-specific heuristics point towards a common technique for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dcbestwings.com/uploads/files/namopate.pdf In PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/bagat.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/redesepabowuja.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c0039a51e---75359050196.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/vlelkdbqu58tdk8fdh2vs47olu/79982015636.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/71453098282.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875f2622a1---5994723048.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wajikozirokuwo.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/vawurefajuki.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/ferafidopiku.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f66c7be3883cd5f7447108d52f04b516/16053787174.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/22963551956.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/70763b494dbcdf32390212ff661da32f/xagafekikupod.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mejar.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd57776acea---39947398982.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/zerosapusanilak.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/gixufizedopadimudonevejol.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a60030cbc---sevaxoxosabonimijef.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/44390502004.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/19121047316.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b766868df57---88694755241.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161108d90b2800---nuzitisuxogolor.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/53207262003.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/90026509822.pdfIn PDF document text
    • http://mopron.ru/upload/files/51471148248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=subject+pronouns+explanation+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_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 11160 bytes
SHA-256: 3d78aa6abdf8bda7f4d81d36cc8100128e8129fddd815b7cf83836c7bdfba1cb
font_01_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 18540 bytes
SHA-256: abf45b5b354559dd979e8d7ea78f9e09aa169f1e5c7f3f139f0f3ef95adce6c1

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