Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dbc325a9d8224c…

MALICIOUS

PDF

83.9 KB Created: 2021-08-28 20:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52f010a3df1a5451be47206d5d6dfbde SHA-1: 02eec492496154b34f4da85502e1c2c302b3499f SHA-256: 05dbc325a9d8224c734453afa2cf7b51cc0d154b4f3752499460b5d9006de989
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=call+of+cthulhu+7th+edition+bestiary PDF link annotation
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/4180158270.pdfIn PDF document text
    • https://zold-kommando.hu/files/gerezixobimetofutevam.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/forizafasoniwuna.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a6456150---92938891121.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/98586556044.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fuviwenumaxabe.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2f97a61a390bef5c3926f0d7c19e7b9b/newabol.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/87582498753.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kh94ja862drp5hm6ede1bh752/berosudefomavinelitufa.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812af5b65d4---68417299792.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/19292530469.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/wepubotogoli.pdfIn PDF document text
    • http://mutitar.com/user_img/files/gizunurutijivax.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ef358a69af37cc85ef4c68d0c8edb3b9/92378012707.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/21dd43fb8993d450dcb91bdc58bd7a7b/569736864.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/dudunidatajerezix.pdfIn PDF document text
    • http://etnorom.hu/pictures/xumodanuvimekonekufotazer.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b2d490f0b---52123317359.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///39869604997.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f92ea0205d---58721908541.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/ratenuborabinixav.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gopan.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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 11008 bytes
SHA-256: e813f66653e155ba6b5390bf5ad89f11dd24a6a8542a8eb6e193cf3db93a0f96
font_02_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 17768 bytes
SHA-256: 276d10ab3bbf1d36a2a9b41886696564f69b60db9204f819cd2d09767b32254d

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