Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e3013dacc1a614…

MALICIOUS

PDF

122.1 KB Created: 2021-06-20 16:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e8064d1f5c6f9244045026230cb84421 SHA-1: de0888520575ab08d9b185308e46e041c3a15fe9 SHA-256: d5e3013dacc1a61442e1ca501d42b402c0ef3e83527d28858014baa0cb5f7a9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pv2uo31qqdsc18v3ua8vru6v0t/soratama.pdf In PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/29be3a1a6f71fee8a4f0ff22aa87a892/xabatorub.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608414eae985d---26021129205.pdfIn PDF document text
    • http://sparkpro.lv/content/file/luronit.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/76591428823.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/26686652666.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/oj8idpc81m8n8617m3sckidp4o/46122938257.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/m7q0eno9ltci27lbpi1nl0b77m/nugagitepijuxiso.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1fcc74b2---95890812003.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/64500a4365823d05525959a10ebf14cf/faboxaloxorodajepuva.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b2117a1758f42ba586c1609023260953/53306060790.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609433453d2c7---24307007997.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1cfb94e71961f58d55530490fc66d031/80814963538.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3f1f65250---samolirevakolivonazefek.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/qn9drccdf4u2278uqlf1o8b7s1/nakarujupon.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40c77d9ba---kotuji.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/uo7q32cpdcnia4d9qsc7tgdvr6/wekapisisajoxipewujudu.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=malayalam+masam+2020PDF link annotation
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013984.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13984 31392 bytes
SHA-256: 4133bf8296e5374c26628143d3b4ea2c8e7fd3f6883f62b8752ba2b9037ee420
font_00_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 5116 bytes
SHA-256: d91b9651a536dc9ae9fbb82cc12b51343dafedbf74298a5bad20cc5b232b148c
font_01_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 6556 bytes
SHA-256: 48fe525f26a65b9eb72bb76a13ec3935551e15076572746d3138a36fd917bf47
font_03_sfnt_off000191ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191BA 4636 bytes
SHA-256: f7ff0ac450806253d042266adbccfaa771fc7b492c2a4a4359a39800669609c3
font_04_sfnt_off0001a332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A332 13256 bytes
SHA-256: 331cb887188f539a6ec367e40eb655f0cef3b48748f6f37988f8c093ceeec8ce
font_05_sfnt_off0001cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC5D 5580 bytes
SHA-256: f2139aaf8bceef8586229a274ca15272c122018c628e7d46f8adf6064fcf898b

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