Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81c4b7fdfef1a74…

MALICIOUS

PDF

47.3 KB Created: 2021-09-26 12:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f67ea8fbb02aaffeb62c9a53cacf806 SHA-1: 4758d3699660aba344c524c4d3e82d0cc5a8d9e4 SHA-256: e81c4b7fdfef1a7489e8e20f0b1ef32c7c93093375e566e3ed48d34138aa8f0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7332

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://allytemp.ru/uplcv?utm_term=medium+in+terms+of+art
    • http://samtekelektrik.com/files/fufopajupubez.pdf
    • http://chonburi33.com/userfiles/file/76417590269.pdf
    • http://moyamoya.center/images/hand_uploaded/files/sasafodadiwipifikuzabaxu.pdf
    • http://malopolskiszlakwinny.pl/upload/File/12914418659.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/nuliliralafun.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5eb11d137961e9aef066dc537480f509/30570714184.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36515801845.pdf
    • http://letsfinal.com/userfiles/file/12151431535.pdf
    • http://dokumsuzgec.com/userfiles/files/luzoxawakakukonaxigaxabi.pdf
    • http://asiancfea.org/userfiles/file/1570162275.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/sogizim.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd21b67eb---silura.pdf
    • https://manenshop.com/upload/files/12228224061.pdf
    • http://ipsgroupjjn.org/userfiles/file/318454823.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/g6i0rm4g8fcb5met6202nsf9if/devagiziletizoweda.pdf
    • http://enricobarraco.com/files/gotidonelewi.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424b81415cb---57424898455.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/99297438075.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/lanab.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/banimexonirotule.pdf
    • https://yocarbroker.com/upload/ckfinder/files/89453578840.pdf
    • http://ky-auto.com/uploadfile/files/dupugiresejosu.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/varumubuvobopexovibobema.pdf

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