Malicious PDF — malware analysis report

Static analysis result for SHA-256 14814e0a09d5e8ea…

MALICIOUS

PDF

76.5 KB Created: 2021-07-07 10:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05f7c45c5453c03dc92f406aa068d69e SHA-1: f4c18b27a233788fea4ed065736e8da1d977a34d SHA-256: 14814e0a09d5e8eae7752fcc51984ccf3c62d8b2cf1661a347b0d503684d39ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as https://ketchas.ru/uplcv?utm_term=the+8nvisible+man, are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=the+8nvisible+man PDF link annotation
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/950f0244db7622aaa2a4005a73183048/36634904374.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/44698441166.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/sizurufokalud.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f89ca6655476d501d0f7f93b41500422/88506287539.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ac9ec1ead77be831f4fc8f82b94124c8/gaxaxu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/251e6310719e581efb9f068b5813177d/dafobaso.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeccc3020f---pojebabodun.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/86274128322.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/77443307507.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/dazivo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cf92d4177997a3f1eb301882013361d9/82136344582.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/18006885735.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/rinasaba.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/galinoxiruwetatumumamomur.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/73911315143.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/4691252885.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6e9b75e9---bidulodoza.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/nizekagofiwupukomojega.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1f5e07ff---donizogawudofenilumig.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a4712b7b6188964a4c2f3dd869e743bd/83438344254.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f001b7d81b---pibaxovodezoguga.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/rikebasonasez.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a3fdb120bb2a6a225599c49937f877e0/vekinulimireboz.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ec883294---girelavut.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_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 15692 bytes
SHA-256: 36637b64203e38130e9bdbb73e9fcdf301326fd6301972dac8ba568267195a53
font_01_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 10432 bytes
SHA-256: 24a1e213f2e265c957329ba2a6a8392275de14d9da6236f5e10d33e9a06a2089
font_02_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1