Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4dad949a3acd25…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 23:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84c7aebf18d53c13152d4d422c153c34 SHA-1: 2aa504f1a5f6ed2131135ff2710c2d1f84b4d17b SHA-256: 6c4dad949a3acd25d3d9ef9a654acc3d9ef4f511cd766bb8048ee334d8925e2e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=android+phone+screen+dimensions PDF link annotation
    • http://sola-brothers.com/userfiles/file/jalogosixidibuk.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/67577884144.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jigosetumivugog.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/bizigexi.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/gufik.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/46331748812.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/87253205828.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/morular.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/39309255498.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/16040634569.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/8206896102.pdfIn PDF document text
    • https://combrooncom.com/contents/files/56158765545.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614163d79b5b7---razerekamegofado.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/93391555731.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/59701160757.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/labupunonifolokim.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb0b09428---datafupetetip.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/96793528775.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c976badf7c---mudunatebexawiwoved.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/vitijubefalejimu.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/serizasis.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c867eda8---61222833201.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/92014003485.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/17820674503.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/14/75966558604.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/14068768023.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_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 10456 bytes
SHA-256: b7f38a5affa8895bafcc5409a06d321287057746f5348a63d0a4bb4fb0173a59
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 17620 bytes
SHA-256: 1b8be76594b3b8ee042427760a119fa2fb9ddd94a3c4dc569c51b76e8ab3ecc9

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