Malicious PDF — malware analysis report

Static analysis result for SHA-256 7463d66dd98670db…

MALICIOUS

PDF

88.8 KB Created: 2021-09-08 22:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3ce1f04f1c3808ced5be119569516fdf SHA-1: ad77e91fcc8e3e6d01c0cf4a67f6364c3f3e2a67 SHA-256: 7463d66dd98670db10548baa0cf632a23f34019a87901c710d44891f220cb82b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links strongly indicates an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=doctor+strange+full+movie+watch+online PDF link annotation
    • http://xedaptheduc.net/app/webroot/uploads/files/62711243580.pdfIn PDF document text
    • https://artbynela.com/uploads/file/wenezogali.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/wogaxuladazedi.pdfIn PDF document text
    • http://posuni.com/userfiles/file/budisaxenutifusefenaki.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613463ba6bfe6---xisox.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/mogifosulefag.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/nejazazibemexiwek.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/7340949430.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613732d233786---sutavinawo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81067684660.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_C3AF3874CE4E7600.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d886462a---56424985964.pdfIn PDF document text
    • http://compsult.net/userfiles/file/13370418400.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/80137162635.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/bidirojotiwoxega.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/lamukepumo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/sanosudin.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/medefowubekema.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/xetulopi.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/gubib.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/bixuvewixafelukanob.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/91890448708.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eccf8b261---75987467689.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tenawuno.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_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 11036 bytes
SHA-256: b07066659a774105217d689591a1fba970ccfaa703c2c47241f7987ff86bb6fd
font_01_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 17628 bytes
SHA-256: 358ecb2d73b258d73f31d37848b96ca7aa6f5ae20e233dbb0770fca0e4d23c78
font_02_sfnt_off00013dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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