Malicious PDF — malware analysis report

Static analysis result for SHA-256 3858f4d78a8ee1c6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 14:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 637caf3b3678357cd9afab430a064f72 SHA-1: 6867f7b85d44d05eccc3ed11e7cbcc73ee358194 SHA-256: 3858f4d78a8ee1c6168817351279badeda965fb42e33f4096168e0a3b233099d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also includes numerous links to compromised websites, suggesting an attempt to host or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc855e8c8---30801599934.pdf
    • http://anandamsanyal.com/userfiles/file/54068048388.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/gutulaxobexaxivuxo.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/1382cb3b6a5fa9372398d7ffc3758e87/wuvafapimoludowidomasu.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37f5d90f3---56968855282.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f76ea358---94333723724.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/365d68d1bfa5053b2d512ee0448f082a/vuvuvutiborafaloxevaxamed.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gowexewazinatajofix.pdf
    • https://groupburuemas2.com/contents/files/25360508622.pdf
    • https://qkon.ca/images/file/fodidokilixebi.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/df5037806a5f3084afeea1a6e772c60e/8385212421.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/jelowanajupopagumorewomep.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dac2461d2a6---87751434755.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d25385141---fokuxisigukojulemi.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/54dd66e250b83c4f634c0e5f61c45b30/19017814047.pdf
    • https://zebcom.in/userfiles/file/98867908313.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b893debc65758638f481b6452d3086ed/85311116855.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/jmjluma8iq8f4u6e7vr0ibmld8/83739739624.pdf
    • http://cesishotel.com/res/wysiwyg/file/pafazuvugisigoloxakof.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726774d1a6d---28172008698.pdf
    • http://hornets88.com/clients/56662/File/wapowanuju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=buddhist+tripitaka+pdf
    • 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_off0000cba1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 16792 bytes
font_01_sfnt_off0000e3b3.bin
d49e32a719586edc3db7905415b8e4962a594b9dc9d46c7a5109a88f769d2011
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 21088 bytes
font_02_sfnt_off00011aa6.bin
180d955892db854ee32df8aac6694b0ab8a9c4ce8a30851e39c69e8fa576ccfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 10440 bytes