Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e81a4dfc4abbb1…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 20:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6456e439469fcbeb89ac15c85841b5a3 SHA-1: 2b9c62c21baff4f744654e82debd373c9e8cdbdd SHA-256: 52e81a4dfc4abbb11c26b7d8edc3c7f3bd9f21d3f8a88d7c2f266e2c54ee374c
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs indicate it's likely used as a lure, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=applied+corporate+finance+solutions PDF link annotation
    • http://rehahomecare.com/upload/editor/files/zabitabi.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/nixujabajaposevisonub.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/87998582916.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608069759871a---71913567360.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/rerozewav.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/69370889483.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/65998474923.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b2deec6c---29427763059.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160da7d10397b6---bofidomepixorotaxupozojo.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/salebutit.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/pemagoxewofera.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/paxegezexokenumukur.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c31433a4cff---22742992276.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/20914956676.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/19959703714.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607480db14b9b---53489653052.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/74180390325.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5gug1a57eklhi7841p6p6986hg/80028285801.pdfIn PDF document text
    • http://momsystem.ru/public/file/52537615482.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/67812627239.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/82133208336.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/wajebosanerubuluxowowafub.pdfIn PDF document text
    • http://tencanpowder.com/d/files/ralileruf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160799f8a825ec---sutobopisasiwibabileras.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/rizuduboresutogaz.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_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 18196 bytes
SHA-256: 301df6adaf01c0cc61a6dffbe6b0be5bdce149785c037394fd67ca933c365cbe
font_01_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 10692 bytes
SHA-256: 97aa5b15d2176461ad685778c62db1c370f7a415fdc8dbefef49ba7230156de2

Open this report in the interactive analyzer, or submit your own file for analysis.