Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5ffaab165784bb…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 16:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41da1dd49d79dbac905711da25fa27b6 SHA-1: 463bfa08c477bef2787edec6736ed9ef59140d6a SHA-256: 4a5ffaab165784bb9295cff50b4229434c28590f60046278fb861e0961c4b143
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://wastran.ru/uplcv?utm_term=fur+real+dragon+instruction+manual PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/s5ofps21pq9bglffpcanuc1hvu/dadetifusoniw.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/46020574296.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pmopsg8np6oprbkjkd6r7cgka7/joxilofomo.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/23957890032.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/pidajoduz.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5a11pet03jjelfsjntc6mu8ed7/39391426321.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161286bd658c6a---balirimatazirevikerin.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/21ba70cef4dd787b1f3776f3f2f21609/3098156600.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6127cd8d73---55184437208.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f208439f7456f2e09ae3259b3fc902e8/39968490508.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609afda5547b3---96821657966.pdfIn PDF document text
    • http://vtaky.sk/media/file/dujikozurumotozepamiwa.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ebe3fdbd4ab3c8da9e1d55f8471cf307/37324822447.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/sogepalexoviposinu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/c1g746harer9ck5ckh4eu64vv4/77720365648.pdfIn PDF document text
    • http://goldmustang.com/files/files/nonilenobuwe.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/vemuvasolope.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/rodilotazuruvojixu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/wikoserufanoveduvede.pdfIn PDF document text
    • https://kultmotor.hu/images/files/25515394640.pdfIn PDF document text
    • http://envigest.cz/upload/file/xajaxetawogazajixejapebu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e344c4c96---nogokozeduwuninefad.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/dosuwuditotojo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 10788 bytes
SHA-256: 79144ae7699ca90035731678d16640de9635fb15f8b982fc389889efe6a86521
font_02_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 15856 bytes
SHA-256: 5515c70a5a76598695f46c5321821af1662f2177fb27b2fd82c59ec614331488

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