Malicious PDF — malware analysis report

Static analysis result for SHA-256 9137fd3550176d69…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 21:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5be32aa30cbeea93d4956a2286fb8ec2 SHA-1: 1e81f2af189c3d2de9573836b7d866c0bad34401 SHA-256: 9137fd3550176d691fe8408f5f3f4bea9588cf5f9a80ea99b42dfca8157e1573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest an attempt to redirect the user to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://coretry.ru/uplcv?utm_term=proxy+master+2020+apk PDF link annotation
    • http://portalcom-b2b.es/img/user//file/_0666785001631361533.pdfIn PDF document text
    • http://alkanboya.com/files/file///27932910509.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vcl04rdlab3tt256ikj5v2ud4t/95387674115.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/35800913101.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/xadelebidiruzizixuviwemed.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/96956513218.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4ejaa83ffmmfq85jhqjs6en1h5/52914001919.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/58525826178.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/25005976428.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/96908203634.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161443a27c289e---28749657986.pdfIn PDF document text
    • https://go2germany.ru/files/file/wevuj.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/sijuvulunopabovugi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9kt91efjm7qq9o9l7s2km1e9kn/35182426958.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/36911412261426b1d063a7.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/10191610216.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/lodijinuwazusolaw.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/33086622072.pdfIn PDF document text
    • http://stylekd.ru/files/pemavererenejifi.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/89739934286.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/18671415871.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/30202116263.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/29443082140.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/nexuzerevojafalerutugop.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/40090882990.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/gexofujobuvulib.pdfIn PDF document text
    • 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_off0000c079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 18668 bytes
SHA-256: 8e4a6df87b83cb16fc2f85df9ce27c1ca454855b0ea79df34be8237b56425c39
font_02_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 10724 bytes
SHA-256: 704cdf30336250ec842b4473e5c4ca0298dc74996841f14a6993e5837650ac37

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