Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e7757a364feaaf…

MALICIOUS

PDF

92.0 KB Created: 2021-07-31 02:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c418dfde41ff4e76935f21190004561 SHA-1: f1e5c8c89496313789c9df01f2b360f631c85f7f SHA-256: 27e7757a364feaaf328d7c07b84d12ea41a986bf95e7499fcd33930cfb48ed0a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the link farm heuristic strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://aven.su/userfiles/file/roxajezuruvizatafavese.pdf In PDF document text
    • https://likeevent.it/writable/public/userfiles/file/31579273802.pdfIn PDF document text
    • http://sieuthibds.net/images/files/23467991894.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/96331772611.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a835bce8b2---78017670040.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9ff834651c644cae68817a867e076ed2/82121734589.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cd2e553a93f983f056573f06523ca19e/4617448586.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/42387070633.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/43805033330.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35965822b---vepupubaparev.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9837d5683de63dcfcdc60ae89a7c70b0/5794195620.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c42e08fe---62742494330.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071677c95ed0---97792579273.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/86426830120.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/74212723428.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/kowabowano.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/jujunijosobenubuwujowa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/novadijefeno.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/93600846466.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/riguzujozowozizu.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/23794035997.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/vuxokukofomurejoli.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210611_166F0513C4522494.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/67810997524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=past+simple+past+continuous+storytellingPDF 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_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 16828 bytes
SHA-256: 34deeebd43367d751e0a6d70c81d89f60531d71a234bf21ba854ee99d9714d2c
font_01_sfnt_off00012fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 10932 bytes
SHA-256: 64669041b0e5cd1c3c87cfca90f20707a3787a7753a366cb3596e49c24d2442a