Malicious PDF — malware analysis report

Static analysis result for SHA-256 e700c9c1e5fe7e4b…

MALICIOUS

PDF

66.6 KB Created: 2021-05-22 10:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdce87433576e6e34844054990b502b2 SHA-1: 74915e29e82b6a4adb06df2b73cefcb98e954372 SHA-256: e700c9c1e5fe7e4b69cbdf505e5be0db525ab98df1d3b51e1bbb5f8aafdd714a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a children's game, which is a common tactic for disguising malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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://cructi.ru/uplcv?utm_term=rosco+de+pasapalabra+para+ni%25C3%25B1os+imprimir
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdffaf43a72fa49fcf5f5d2c2b9657e7/1090822672.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e16abe666e6cc7686fd3a0114b310923/mevavilixosuwe.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608955e261939---wozusi.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c6a4f09---lenazulopofakanoza.pdf
    • https://stratasphere.online/userfiles/file/bewololemodojabaka.pdf
    • https://bojovicsirogojno.com//files/jetosixarupumi.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d197008924---93822936380.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vgsrum72e9cffhhn0eju2okkka/50576606336.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608093ec38620---98532151388.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqe32li96fmi201kf1ftrpd721/wixexipisaretegedena.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f984320dbb---rekenufed.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vcjlbc7pp0elnagtvika90p1n0/munopavaxis.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a71d42e8400---79364106877.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4c906f64---tipomumitusinixinuvota.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/jefobapase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28f.bin
af9755b2f8d281c5fb0fcc907d872eb35d50ad4375848649995a37567a1eba87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 5580 bytes

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