Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e23cc91e6db975f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 02:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ddd05262d12ac85633d2c0fa254cc49 SHA-1: 0f9d9565a774bbce4be0e5c0da4f693c80e8069b SHA-256: 9e23cc91e6db975f8ddd92e9ea8cb4977601f59e12d2d35102d4dc5ac3f88d55
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or content-scraping attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f908cfc4f1838e7695e17dd23c422ba0/25183784682.pdf In PDF document text
    • http://singer-island-condos.com/userfiles/files/lemewijafusuzuja.pdfIn PDF document text
    • http://labonscafe.com/userfiles/68008699036.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/kewofobidum.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210904153416_gj3335.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/58030992430.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4209656189.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614605a52026f---dipulezineredafukudax.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/69684139120.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/laketutapaxakumobawobizuz.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/28999400371.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/96860079135.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b972c81a5a---85984292752.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/85547793308.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/wefijuladabepuz.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/38554189929.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/26714156717.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/bofabeguvinibujebite.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/vigetuvufubitanem.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kanikexejexodoxob.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c6c773a3---kavebabekobadagopikasera.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/86311900656.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/famadalasefab.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcaad54e71---89437096212.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/35722804770.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/sagosubevakutorilep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=easy+root+androidPDF link annotation
    • 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_off0000c622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 10160 bytes
SHA-256: 8b1599bb069b47ac90eb19734129f4b1cb295fd6b0815570308af585392978ea
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 17148 bytes
SHA-256: 6d7fd1b134df4f0a5adb96650ab5ebaaa08d96d78e4609c80a1781d5fc243aec

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