Malicious PDF — malware analysis report

Static analysis result for SHA-256 5174762d96b89094…

MALICIOUS

PDF

98.7 KB Created: 2021-08-08 21:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b57f00c5a4fe9ed99bd83ec7bdcca427 SHA-1: 25e5cccc666da434893c80ac3b96207e5d2e29e5 SHA-256: 5174762d96b890948cdd7357c20cf6d9abadf350eea844c42cd54b7d097c3c28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://taketty.xyz/js/ckfinder/userfiles/files/57260882452.pdf In PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/7924096945.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d2a6b1f0e8559972459a68ec024b64fe/tuvojimirijarodipubi.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/bomaxarebexu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160833a2ec95d0---62625255564.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0qvve0o4evv5bs9003eu9qiv6n/34942661224.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/pefuperagojipitaj.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/15b9e81c2acb54b53e6d13c616117ca5/23628648414.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160881af744fc1---11252441322.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/50030133770.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/84819266331.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/823246909.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/viderajugasepejowad.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nccrfajkg76bb1792n2e6ss36r/kiwuka.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/uv0tg2tpu3p74tvjlm9m0kcgo7/laxupunegexolemopefisokin.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/88944699559.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/47ocip54d3cqgqmkrrh1oo59ec/jakagel.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210724135618.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0adu0g66ra71le4eknok4l3b4u/55449625411.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddd607fe8---fixubimabazimixikuxizigom.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jeveru.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9cb029b45---56792348407.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/fceaac00dea21f76c43dc185ff1564c9/98311426971.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/dizevanogobowefumaline.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad7859b44---fegutasaguwezutukol.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e2138eb4---72986159799.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d91c82513---75712131651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gta+v+merryweather+heist+stock+tipsPDF 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_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 10888 bytes
SHA-256: 43354aafec3e22f153368c9d8fdd87ff5367ab1c5a98f8d8226fd4ffd1cda915
font_01_sfnt_off00013568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13568 18048 bytes
SHA-256: 579f8b64c0979a1bdc978b6ea6e2e41a794b8e9de27aa12fea195201b9747e25
font_02_sfnt_off000164ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1