Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d20799c8fd9f1b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 14:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 120b6ebadf8ddd2b9b2befda3f0a0589 SHA-1: c8c9fa6d50688eec9df9d98c606ba89fffec9d3e SHA-256: c6d20799c8fd9f1b0511197328dfc24c134177a40d11c1c508d8643d1a8610c7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=hire+android+app+developers+in+india PDF link annotation
    • http://elisa5888.com/shopadmin/upload/files/nonobosarariwajikiwiloxu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7c727134f9db0f9203070f3b6839cb19/62134283431.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/wenovipozaxakebigisugidib.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/20566918330.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/topelidozisejose.pdfIn PDF document text
    • https://braus.uz/images/shared/file/bupidiwudalifufefejokoguf.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/zupurematejaxufinagef.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/wupuru.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/murovo.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/48294797646.pdfIn PDF document text
    • https://basisnomor.com/contents/files/jakopurigifupewabowaw.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/gegozamujerukugej.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/surapazedesupepedoka.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q862i3lkkt7m44h0iucqf0dn76/2434303920.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/muvogifowadeketepapive.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/ferobatenevo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wuvozibekigunubagez.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613295245f93b---toxefovedigonawobov.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/3349721632.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/84087734157.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/jidutokod.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2e10ad37f---297029192.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/miwojodisewemizajugu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/27c1a44e35b363acaa8b00053bc4a228/35569520333.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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 17780 bytes
SHA-256: 90b02605ea55efdc15477e2323d6e846717569f614816f184f165077afdfb718
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 10344 bytes
SHA-256: 079e88c6635137951e90aebdc1ee187ad8abef1fc208dfaefe17e30d9979e710
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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