Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90df2d205b65db9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 03:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad57fd3397123195292e55edadba5284 SHA-1: 1a6919a5e848634b9b825fb4a7c971eebc5a2145 SHA-256: d90df2d205b65db9d8d475e6bf8e929220295b15352eb67123c2f6e105044fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_URI heuristics further supports the redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=employment+contract+pdf PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf84372480---81791656552.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/91293733970.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/86025180659.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca47862f9a---53263162661.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/rupunidobilutoduwasa.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/58415825500.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/44564715522.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613075341fc7b---39577950748.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/62706024973.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624505300.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/86846658561.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/77753421832.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624539859441669640.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/vazalu.pdfIn PDF document text
    • https://coatielectronica.com/files/xinolesopoxikuzur.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/jawebe.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f53f4a4f7c4---75272624790.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/tepugare.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/fumubebedilexamavo.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/jadugokatuzenitobujorar.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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10620 bytes
SHA-256: 77950afe47ae928d678957051aa18272f43b8a55f1cf65ea505dbfa0e7684236
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 17164 bytes
SHA-256: 370e7983e79133843f78c2b0282229356196664141f296021537590c07fb0ad6