Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a725dc592e1cbd0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 10:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7cc11df59a6e1a014bdab36635d5629 SHA-1: 76c63e936224ba6bf7e5b3695e1e527b69260bf6 SHA-256: 4a725dc592e1cbd0ea5905de002f270ad5a25df506006ebf3fc79f8bb12e4822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the presence of multiple external URIs and the heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=insert+multi-page+pdf+into+word+file PDF link annotation
    • https://webhosting4.net/media/file/ratupuvadokoj.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/083921b90b2dea0f1b59c9e67eeb30d5/denemolononemero.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210727_CB123D61B9CAE5DD.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/zowawum.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f9f52fbe28064b6bc97d24ca5e37dbe7/80223899255.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607735f693577---zebosakorixef.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/zowujuzuwed.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/87816973338.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/37538984059.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/vidinuxovoga.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/23349266437.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/34f507199785d6fe1a2360f6acef25f6/97609702579.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079885553a54---zukot.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/97g82luauriri2gk7lor53j3s6/63625114057.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea99e05ef3---tibiresojiwas.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/54956339029.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ec8a4ca9---foboturotonuf.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07a26f3b4d---sivijuvu.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_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 17084 bytes
SHA-256: 9c9cbdadb273e9f8c31602c6b2460e92b45ea7ffaba67ab892230758196a7b67
font_02_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 11012 bytes
SHA-256: 1af154b1a22c4ac3fe8dc83fdc2f11d35b216ee892f6e6b932ea6969d8b514f6