Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd44426ac35eb5b…

MALICIOUS

PDF

82.2 KB Created: 2021-06-17 05:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010e6e4a5120ba814a70e65bc013dbfd SHA-1: 3edae9384f050233d1982cfdc2bf93a6d8ed87da SHA-256: dfd44426ac35eb5bcf36658508943d2c8ed29837b06dbea309b59393beee8214
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are part of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=endocrine+system+easy+notes+pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mpvndm8guklfk0jmm8ci4f3b09/40095549234.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ac941498---supimezudirusano.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b1a5860c---zejatufepuvusoguxivo.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/58280523633.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6129214375468408f4aa48e5c1b6c700/19534762802.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2k36vi07ethpeq8holn0jsfi69/19665819590.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/xexetiwu.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd31b046c7---68256527585.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/4e81d084d5b360eb2d6cfe7f5168f378/74134958351.pdf
    • http://andlupa.com/userfiles/file/dibexe.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572f6671e8---tupawul.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/89613ac7b400e90164fba884c57b86c9/94175724680.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f8e268ab---51074332387.pdf
    • https://laser123.com/geektic/files/padawuladep.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607970a9ae81f---ritinilelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020f.bin
4e6c04a88779b84ee3b70340c772f1ab85262fe6710dae53784b3ffe5e872c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 5328 bytes
font_01_sfnt_off00011426.bin
60d8870998ebe081c0dd0d18161b9afb5e78c9066aeff3c51022432b522176b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 11332 bytes

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