Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b7ba0ccb226dfe…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6383a05394f1beb7e8e9d948695430d7 SHA-1: eea49931ec38104d3f22f98ef0ec7abf131d2ea3 SHA-256: 18b7ba0ccb226dfeca7c6c18b1145b08dfb0c51f5e21ef927ba73ab84d933950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, suggesting the document is designed to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=watch+zack+snyder%27s+justice+league+free PDF link annotation
    • http://brandiassociati.it/userfiles/file/sazawajutemam.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/52702336740.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/luruxodebagakuda.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/36643251124.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/pamomigobubefodeken.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/mebilifuparorew.pdfIn PDF document text
    • https://kapefashion.com/files/files/dikaba.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/welubojepesasoxomaxaful.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dddebae0b---jilikusawumujupuxa.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/vibosoxizisodalafu.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/47841615014.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/44938976013.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hcb9ueatnerr3td70ahic5poga/39463293554.pdfIn PDF document text
    • http://signauction.net/userfiles/file/lagutomokabiluvefako.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/rizuwopejonesegulugugakix.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/muxuxa.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/ronuvep.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/linolimatidalilefa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee4e680de---pifesumaladuw.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/21970673283.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/64436108454.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_off0000be46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 17808 bytes
SHA-256: 8b80c2c1ee5a44d0a6300514c37a6f7dfc33c03485a19e157128c8cf307b01f1
font_02_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 11160 bytes
SHA-256: 986476d4227b562df1fca16f3b4a93e9d71ec189d70df5b38492f2eda8acfb6c