Malicious PDF — malware analysis report

Static analysis result for SHA-256 587765d25787595b…

MALICIOUS

PDF

66.8 KB Created: 2021-05-31 14:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed401be76c1ef483cfc6950076bd0991 SHA-1: a52a4cd51c8c519c160c5fe1d92be03843ae2916 SHA-256: 587765d25787595ba8922553ef67a52526449103590be0ecfa38a1ebc47b88c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through deceptive links, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7832

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 https://crysiq.ru/uplcv?utm_term=what+is+a+muck+fire
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5ba6a508bcc45bfa166532dee039e39b/wuparosewimi.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e902694ae5---rivodowewa.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/165euvrp4p3829kq2ahvur3gr6/sigiwodiwufeni.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e483fc6c1a---moxafefixaluporer.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9nfsbg0ctt1eoon5bvglkds1c0/gotanipinexiluseviruzok.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f640190e21---tigeka.pdf
    • http://asckhn.com/acskhn/userfiles/file/78636972604.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2c17160c---65796655949.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744c00f40bb---larujidipo.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/20705472531.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/85379898829.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b16417efc30---3630933309.pdf
    • http://sunjewelsonline.com/userfiles/file/wudisukigefago.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/226a377556ef98e7bbc346986be530d1/juporeduwituzedeges.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f0585359851ad49fd038a8b4d9f1af5b/98516335509.pdf
    • https://alamansyria.com/userfiles/file/gikamipalimixisi.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f963dd32c2---zizojifasem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf21.bin
f7e72b73154897ed8730d9d102369c391fe72ca1b26120d475edf1ca74200836		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 4832 bytes
font_01_sfnt_off0000df95.bin
f64b10111282023d7c5ebdca42b5691ed519869943a697055d60c9e30c12c496		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 10364 bytes

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