Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c9e56f48dbcc89…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 07:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8875376a87399e972fc92d3be8c54cb6 SHA-1: 45015914253fd283cc7b2192ba181b30176abe79 SHA-256: 41c9e56f48dbcc892124d9c8a9e472f551866c6996b6b8f21e50667a7666e7ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=como+ocultar+el+icono+de+una+aplicacion+en+android PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161330d6a67ccd---satep.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/migegajanekeso.pdfIn PDF document text
    • https://pecsikult.hu/files/file/82470650146.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/632845303.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0f44048bf9e5cda6933bc40e7e371c8a/40628452300.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xaxarimewovapan.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/wixawulovakinas.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2916386d4fdc0d8a94eeefad16095d37/96076924382.pdfIn PDF document text
    • https://mcsfood.com/images/file/fofivujuxozik.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/xibuvuludujojawomopogopu.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/92117751906.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16134331f9fc72---54456366225.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8ff7f415---69694979758.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/risulesujajoxutipa.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/59cafcde44ebaacb04665bbd75fc2000/nemukinugiposonen.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/vogujagidiganilepovizej.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/dojorexojibifug.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/giniguzaxixojubaxinofel.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/weberajij.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/33397721607.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/nedisurodofalogarewu.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/zomubelokaleromufow.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_off0000b7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 10640 bytes
SHA-256: f9bc974708c1e2f33dddd49faef2d86403b09516de30218e30a6ada1810f7012
font_02_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 15932 bytes
SHA-256: 3c5a4e428c108ef48bbc8d043748f6911832755b8445ce746b200a901c1a6475