Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90d1697558850fd…

MALICIOUS

PDF

72.5 KB Created: 2021-08-28 06:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 800349ebbd859055e671f8b33608d3e8 SHA-1: 455322ef3a155a7cf6c6f8d7353d381a9b504215 SHA-256: c90d1697558850fde8278b44b13913842a560bc92c9e66057f66be38fe3f87eb
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The presence of embedded JavaScript and a link farm pointing to numerous PDF files hosted on compromised WordPress sites and disposable domains suggests an attempt to distribute further malware or conduct phishing attacks. The embedded JavaScript is likely responsible for initiating the download or redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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://dansungsala.com/uploads/files/xewoz.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/tfp2o5qr1g9vas74qebdoq87pf/25093677841.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/99996606665.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0d0ed55a---buzej.pdfIn PDF document text
    • http://forti.in/userfiles/file/5154896521.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/46270002774.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b495fb10---91206383484.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/narijedijebixoxobasu.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/hdqna3g8ee686tnv5mfg0tlkqp/19915265398.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/92564153986.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/bemasedosikas.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c78dc816ecb2cb77f16ef405ce2be43e/72967474978.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/26614555268.pdfIn PDF document text
    • https://rinducm1.com/contents//files/xodixadabizixek.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b6c4966364fbb2246d81ab07d44915f8/jukewaxujowiwem.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/m0en8kunqed43ldbu96lg1std8/jolomizanulaxagibun.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/58bdf6fe9f0cf4c6a932a4e3528f96b1/81629580719.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/87fccdb886f44af442a3b316e76c781f/mekipibufipo.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/lilobigetadepasem.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/zawurinixotajutujud.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5c484304bc1aea0c867976159a33e2cd/39165721578.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/jutipus.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/28649468996.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0291a740a1aa57ebad6d392c80688e3f/xobod.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ooa12cch9njsvacu33etl0q48r/rovozilidukalaxum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=begin+transaction+and+commit+transaction+in+sql+serverPDF 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_off0000b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 10980 bytes
SHA-256: f3337c328907264facf0c5fec9f51a112ed711c247b2de1a8bd8192a10b0aa5a
font_01_sfnt_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 16584 bytes
SHA-256: a75493dbfd99c5da391893e86142c6476efae01d40ad566f81b10dcee230a555