Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c285f7a372ad43…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 20:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cfb0069f8c57386a24d952c68e9ede2a SHA-1: 630d137fbf35bccc50993b5186673513aca29677 SHA-256: c1c285f7a372ad435d6dc6276d7f3b9f4bb6d977204d621c72d5dab616bd9317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farms pointing to compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous URLs indicates the likely intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=oxford+international+primary+science+4+pdf PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bb878b35f3e28a17ce5dca7efa1ca5d2/158165311.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075abbfdd870---pelakovijinuzotoxesava.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/d6f328af5fae785e0717e2370f9744a9/2013350893.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/nurixuwetunuwigamatulevob.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5ec375f83---49904128519.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/75210701198.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/29a9bc8c79e7b2a3030e449c03f532e0/dulegoxe.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae555bd80e1e6dc7c4d98b49c93526da/pipofuxa.pdfIn PDF document text
    • https://afayl.com/userfiles/file/18063870475.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc9ed94f4---82474259814.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55488abdd5---rijilokapisujutisolugezub.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/l2tqpqqdn1rjsl96ur3nqdghnn/59421102351.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945ea70f652---dadobama.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608598a98e2d8---79051198877.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/49952682664.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/44604894977.pdfIn PDF document text
    • http://altinay-law.com/images/file/11731366363.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd67b993dd---koroxugimebogulunogiwuv.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/dalan.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/891qfnrb48ss3j9bjjb74pgu54/dazasebexabeno.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/78884163401.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/96430745635.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68bab6bac---12572830956.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_off0000ce53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE53 18548 bytes
SHA-256: 166ed2aed248b1778545c94cdb8ec7e26078180d0c6c4a894a305da51880723b
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 11100 bytes
SHA-256: 07fe5cf13d1a6ceff136cabc462202b42af67ea642df338bfb1f29e831b39eca
font_02_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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