Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a61c2a70cb6b0a…

MALICIOUS

PDF

99.8 KB Created: 2021-06-11 22:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b495816e2133d9a0e413f50764a8eb88 SHA-1: 51fdef4368a95f9f980fa7bc4d45fd44b0ef95fe SHA-256: 39a61c2a70cb6b0a886fd454f03ca4d2e45fc6c073e2e6c1fc8b17c8fdc64e01
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'font download' and the authoring application 'wkhtmltopdf', indicating a potential disguise for malicious content. The presence of external URIs and compromised CMS uploads suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=kruti+dev+010+bold+font+download
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da8a859b7a---99602824686.pdf
    • https://alice-immo.com/userfiles/file/17656793318.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09588dc946---kunutobi.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/56e63d0f42783795414af687a985b5bf/77132951591.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8afe445ca---bajebofuga.pdf
    • http://alexlunacoach.com/img/editor/file/49644603044.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a6cd2c80697f9e7d83c46228a348f209/xugilanakawu.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a3404bb158121b43e0786b4b5028d6a0/12063577248.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/fazuxikadakajujujo.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/65469a097525a59133010b5625c1f8eb/lurowixedaropizu.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1ed1bb521c0b9cd50a57772221b2c67c/39231044319.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119d7d7154---64211190118.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ce9f93c3f0fc28aef2c4aa2e846b963d/mizewezanabezonedul.pdf
    • http://kmkonsult.cz/userfiles/file/64309556016.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bd57b7f886cbda9f5e4721e78250ec4a/rupan.pdf
    • http://caratow.eu/userfiles/file/sokenuzabasaxun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f822.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 6744 bytes
font_01_sfnt_off0001090a.bin
cb96fb85d3222c79b72d6147091bf12285b4c3e66158ef55c2c1073af486b348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 5180 bytes
font_02_sfnt_off00011ad4.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 3720 bytes
font_03_sfnt_off00012636.bin
5c1b6bb0812a45518fae06dcef2ec09607620a5e26cc3d380d7ef39561b91c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 11704 bytes
font_04_sfnt_off00014e08.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E08 16092 bytes
font_05_sfnt_off0001630c.bin
d3f94f25ebd377be9a6c9187b926abf8bc8ff09c418f01358a3245c624ba6fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1630C 8808 bytes

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