Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3411f121fed580d…

MALICIOUS

PDF

62.5 KB Created: 2021-05-12 09:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e43bd6f67e236a678ad5d6a66930bc54 SHA-1: 644258c7083b7488bf276617ce6475eb512652a5 SHA-256: e3411f121fed580d1dda6d43d5a669a70dddf8adc5a39e2acf98eb14f1ce83bf
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Android device manager' and 'wkhtmltopdf', which could be part of a lure to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8036

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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/corubipdrd50gvtuejivais5lp/68086800843.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608466e757872---xonapamuganulaf.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33734cb33---zelidomifepif.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed4f77cc63---pajabetepebujo.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f74e1501---vujajefape.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086ffcfde065---54200156686.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c908bc9c08---30680391684.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/11d2fd0cce66954e06d6bc4c055221d0/52633216502.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fabc47749---nemom.pdf
    • https://beautyyaurient.com/editor_upload/file/sofagonadokuzi.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rnejsip6es4mlpm498c505lc12/6969859260.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb5f9d904---11833819831.pdf
    • http://aqbnb.com/uploadfile/file/vafokupot.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083344bb0e95---xexetijirubelowubivax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+device+manager+enable+secure+and+erase
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11e.bin
fa9df3d9d703ff5a5d1ea773985b2a27b63295e6cf32b99a30947ea45441f84a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 5448 bytes

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