Malicious PDF — malware analysis report

Static analysis result for SHA-256 605863e63c2b175d…

MALICIOUS

PDF

77.8 KB Created: 2021-08-16 07:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60c00ef3ab5364fc71183588af4f9e67 SHA-1: 99d1ce8ad67fefd07f7945dcc24d9790c2b7ba20 SHA-256: 605863e63c2b175d4707fb5bde8a5604d2476f122de0310d1db4867410750e68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.tzounakos-insurance.gr/ckfinder/userfiles/files/kamatikojuxufegalup.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d550a1b36c---mefisukunu.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/96184854954.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d315ae42ee9406c4a879d15c124c3da2/mupun.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c288722db---bejezixunafadabitikuzi.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/suxudenifugefekej.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1f3aaf80eab142013f24e08eb2fafa0/32184607363.pdfIn PDF document text
    • https://deepex.hu/hirek/files/roxebaboxalibati.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c912d9cbfed---vesux.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/46987766101.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/fufop.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/76583055210.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ccf972860c1bcd46581393e3c9068be/63971774415.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sowonokisosovib.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/62f249649b71e828aa037f0cff2d12cc/53714686757.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd39d3cc8b---rezafukovodalak.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071edf2b4804---larezisirewu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/51293884760b12c33e8cf7.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210612183854.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/29706000346.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/kinapivozinajo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/fujitajawelulowej.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/68283178285.pdfIn PDF document text
    • https://austarpharma.com/upload/files/wegugegewalap.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f991e1c5fd2---85656377129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=barron%27s+gre+math+workbook+4th+edition+pdfPDF 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_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 16380 bytes
SHA-256: 63227c2fa683e8495ba2ae127efe59d1d9d0ba7361b0c9091a7bdc330e5a9b6e
font_01_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 11384 bytes
SHA-256: 21def2e02524ee5e1c1cd7e99829b55284d588cbe2cac1c0227384bc3eafa970