Malicious PDF — malware analysis report

Static analysis result for SHA-256 21665e13a15914fe…

MALICIOUS

PDF

81.6 KB Created: 2021-06-29 01:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57cc30d7338d3b625fb64c61ee5b9675 SHA-1: 96fafb7d61887f79923ecd5f987915bc9b845638 SHA-256: 21665e13a15914fe4315af69ff72dba8eef640c5b1d8cc91411a89f37d39e564
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to create a network of links for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=can+i+play+playstation+2+games+on+ps3
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/snoed2g86dundv5neobke4cq71/seruzebikutopapodobikurub.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/23f553da0fa6b7733efc1b200495b7d1/lijuxixojijawu.pdf
    • http://seanmore.com/userData/board/file/gurowesiwutiwakepeva.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/baluzeviduwufexavawazujof.pdf
    • http://dmkaudit.sk/101/upload/file/87194233093.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/uob6k2d2qs8jbjvuhkp71k02c3/44981589642.pdf
    • http://ruihuitax.com/files/file/37735996988.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n45qti5502hh53ftash3vqaep3/36644111995.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721cac1765d---16963649934.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6d8aa5184d1cf24d6d391bda0bdf84a4/nuleke.pdf
    • http://ankamet.com/userfiles/file/mutosug.pdf
    • https://alakharia.com/public_html/userfiles/file/76636016447.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074815f85941---mativavadikogubosetidifa.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d650c9de---toxafom.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42d11a432---lujigojib.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb951c338bb---xadefuxazevirotojij.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/118e1629066dd6d85dc1754c022358a6/28751772095.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3d49187052414ad7b240692cb90b8a95/nebixuganavus.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d1b30199---judamibapuwujedefeter.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4dcf13772dd449962e2b0b32be969ec7/96058480617.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/24575683b3981cc9f7e92138ae3ea401/28426755794.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608207c9b84f2---pixavijuwozupusojagu.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ad67bce6f---13934970286.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5f.bin
55e39b39fcb1c44b3c83f52edea3fbc4cffe77e5d3abf97cd8c7ed6c6a351e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16568 bytes
font_01_sfnt_off00010771.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16792 bytes
font_02_sfnt_off00011f88.bin
5c6a4841dfac194e4d329a06c50f18776ad59003069a01b7c845e3fe98a35ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 10932 bytes

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