Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc849fa1cd3c8f60…

MALICIOUS

PDF

153.4 KB Created: 2021-07-21 20:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 349a2a257f12c390f2b9921cd94fd088 SHA-1: d49ddd2af817975e4911631206d45c3da3af2170 SHA-256: bc849fa1cd3c8f607784ffb9111ebf56a2c9d2607d73ca0c65b166f73e8d3ae3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://szwygs.com/upload/98280936229.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/8pe4sjrcjht63pk3hi22tgggqe/mivifitonizakasajitowasag.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/jodasomesanapa.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/tidogimaxetixus.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/lobidej.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65c4768027---71137126178.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///44453551094.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab2fdb4df---lixopitaxepir.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9feda43d1dbe6e0f84042ec40e7a9c9a/jenadu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ce4fd7f587360953f5f32450d512d406/24575059526.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/jubedelawugaxubapuritisi.pdfIn PDF document text
    • https://badoza.net/userfiles/file/52562804955.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/zutanukusa.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05d0b27ad---63658192211.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/nepesokoxijelov.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/8975893881.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c010d4a278---44266758160.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b5570b3f0---76980539295.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/29646179683.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edbd3aa1b---jakofi.pdfIn PDF document text
    • https://medtek.vn/storage/file/kobegekemavutexojupezije.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/tudesafamekoretubi.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/29b2a574e9b211bde32da4687dd3d943/76287762552.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a18bafc8819---kinori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=christmas+song+home+for+the+holidaysPDF 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_off0001f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F693 10948 bytes
SHA-256: 466eeb8127011d6232af85f9aa5d2322d9f893dda63ef53c379dff2b4b4baa79
font_01_sfnt_off00020f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000227ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227AB 18592 bytes
SHA-256: c70ee255b727ff53ffe4c8b0970806d85e12d683f77c00ad5e4eb03d144218b7

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