Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aabac2985c58132…

MALICIOUS

PDF

79.7 KB Created: 2021-06-04 22:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53daf1a30be486ce0da9d1582010f6eb SHA-1: 768171171c1f0a7345e36c6097f5296ddca273f8 SHA-256: 1aabac2985c581320bc935791e480f60dbc17be73ec0553fdf936e9057a810c1
154 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ClamAV and an ML model, indicating a phishing or trojan threat. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The document's structure and embedded links point towards a phishing lure disguised as a free book download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6747

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=pathophysiology+of+disease+book+free+pdf
    • http://jingluo.net/uploadfiles/files/tugemode.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/98d33eea58d3dfe25ceebcf2a09aa574/29873362565.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/feec31d792792d2694844f396c07d2b6/31335934563.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/qppunfq6c3r5aotop65fbkhvjj/5783696531.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f3599b25---kewakubebakekop.pdf
    • https://baongochoa.com/upload/file/lamezavo.pdf
    • http://nakatka.com/files/file/90490878461.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/fadugunidu.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a84dbc35264a7b76cd0a9eded0b7be47/vesedi.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746cc80acd5---xobuwoloxepubeji.pdf
    • http://www.anjhimayath.com/upload/file/865271674.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c711555437---25156390451.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b1512580448395e877ffa132f18bdbe0/mokafivodejolurejewis.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f9c3f200364b65247b126cac8aad7c4a/83269965973.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/0edd74c24e0c56a521df3d7c03d7341c/kuzuji.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf48897a7---76897421893.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/09bd832b31de65d88b5db1a03fa9d59c/11461996233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011787.bin
299895a584959f948b22d487cd7423392988fe4d25308590219e79ff20c0a239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 5612 bytes
font_01_sfnt_off00012a93.bin
d315631624845d767e8eefb1c373e4e883a0eb50fe06d181f9ec891ada23e59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 2048 bytes

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