Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5ddfa7b1268e73…

MALICIOUS

PDF

63.8 KB Created: 2021-05-06 23:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73e2a1235be110282e2f8b557fd230a2 SHA-1: 415d33181967eb596fb1851d8cbc1149d0909539 SHA-256: df5ddfa7b1268e73e3de2103e11a099535575784fae70ff94cf0f91e23bf7434
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, which could be for phishing, malware distribution, or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501194831263008.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca302aee8a---6583349257.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/5e486f22480a97b1241adad706c1bae9/79490905319.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085425eaa556---47213239569.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078646110575---74977728885.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3d48a373b9f1875d4eeea9195bea60c6/22155678550.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b296eaba29---62619614799.pdf
    • https://annjulieskarpmo.com/userfiles/file/gapezajexag.pdf
    • https://alnahamgroup.com/userfiles/file/mofebefifaridowaxagoka.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0816b17151692fbe84dcc3dc9b95d4c3/vevapunapesikinelixodonak.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/v3vhv5k3g1s72hei0m4sj8dndg/77791748668.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/3d85d2cb431f64c8b57f7e8ca8c777db/sudivitigerutoz.pdf
    • https://aterhesseg.com/up_image/file/24299027704.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/60e92ec8a52b83887fba36538bf53e57/poxepejonurub.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/058a0282c75c963396f78e4a34e63b41/57890155235.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071013b06666---winuwit.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5a9cd6c29cc417bb6013bc3f38b381e0/dadutakujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+printable+bulletin+board+borders+template
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df80.bin
5b4e5da9ddbad5dc11b7fc93132b51babd9fe221ee5e7b414383cc299f22f8fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5200 bytes

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