Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd1b57976644cd0…

MALICIOUS

PDF

163.8 KB Created: 2021-05-02 14:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77649db9a8b5132b93a093fe57cbe892 SHA-1: 807f69ce8cfef12d16a496703d2b3e5c64ae7680 SHA-256: acd1b57976644cd04d92a6a70ddf693acfef2f860f03c749b0f601c0e1986613
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which likely serve as a distribution point for further malicious content. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6501

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4d62d2adb351c8defc239a0b944df827/xunamofu.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/smo2jell0012k55odkjpo7gmlh/xirunijidolifiv.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607752aac932b---67284279753.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef992b02b---44613360071.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1u6sg360u61lv7lc0vknt4vqf0/16130902178.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836bc8af005---4400547617.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371b193911---siretunexigizizu.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c08bf938de8f77b3efe1f6947b7a899d/witosajamexodusuvunival.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/afce92756e11b4dbb6ebb79a3aed0d14/747867837.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9jhjs6o5bg6pjlmnfvshshicgb/zusolopaletopotilim.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8b2e2d7e---tumabujobemitimato.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/k66r4ef8octvfh25al9fk3tc5t/55331037325.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/953a114876260e7d96070cb3c119d27f/modigaf.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5aaa699464c6e1b91442b26742a82733/2363710447.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e853392f3a---gawagokedemujifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=swamy+ayyappan+songs+free++in+tamil
    • http://scripts.sil.org/OFL
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023bb4.bin
0e0d9c29e75cf6f71a6a907111f0b5435c4337b124ca009868998f07cec4f6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23BB4 5308 bytes
font_01_sfnt_off00024daa.bin
63b1f787d9da389f7de27c4d2fb1c0a5f3c45111e3337a2a70e2959765389288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24DAA 9904 bytes
font_02_sfnt_off0002661b.bin
390c9a3bdc1f5db5c93af4abab7ae4c19def7cbe525951b98e157a9dd9a0ea04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2661B 3144 bytes
font_03_sfnt_off00027258.bin
9fe37970bed5ef3ab3c23599834100d22e926624f7f219052ceb16954fb0ed0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27258 5796 bytes

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