Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf4a2bde0bd772f…

MALICIOUS

PDF

81.4 KB Created: 2021-06-27 21:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32eeb8031cfae6fe8374bd9df22baa4f SHA-1: 83776be920ff242254a11621ecd0fb74f9d37879 SHA-256: daf4a2bde0bd772f471f9ae2f6357501771c68a46aba2e9bba064eec8fce62d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by directing them to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39c788b78---puwolatofegaga.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/960c6408867324661a210d039e694554/tubuminuvabopopilatugom.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5f156949088048f3a27834918bab031e/67107882862.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/jvdmsjfb3reinvoqhcafvfuub9/tejupotepi.pdf
    • http://naturallabs.de/userfiles/file/limezeva.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3d439558---4079185270.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ktiq0hljl9qomkt51u1n6e341j/xatoredugovagakitadeseba.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5717e55a2c---83612674082.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/bsn237uisrot847qfdptnral2j/47785450521.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6c53f8fd0527a8ba4432dfece239780a/tenosemuzuza.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90d819f084---getadajekanogosu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0c95380d---17733794867.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421fa4bc6e---44727746447.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/sotuvarozofufagezupoti.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072884e4713e---suresisas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=under+the+payment+of+wages+act
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc55.bin
8b54b3874f386d001ee9700f79e480dedc58fde08f9f4b619ef1dcebc252cac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 16504 bytes
font_01_sfnt_off00010752.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 16792 bytes
font_02_sfnt_off00011f69.bin
72341ace10e7e38fa7ef82db4833d5acd0195c7ceb03425729ebe828ea465c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 11136 bytes

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