Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51cf564d1c8ecd4…

MALICIOUS

PDF

64.0 KB Created: 2021-06-14 07:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 59e43f706e27ee07b9122b94ded89165 SHA-1: 2731c54080324bc3d3ce8aaa7b62e6af0b65ae7b SHA-256: c51cf564d1c8ecd4823aaf2c455e4e69f3fdb2018f3d5e179c8feefb71f3cd60
154 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms. The document body text, though heavily obfuscated, appears to be a lure related to watching a movie online, likely to trick users into visiting these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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://huntic.ru/uplcv?utm_term=watch+thir13en+ghosts+online+free PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/et9fg36uf1c6407lsgk5c4k9du/657242476.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/11596797391.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca21d9a34e---76459755283.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/xiketazinizabezu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vq22sijfu0525m3cpq9vhqf0ta/13750261674.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6c669e6fa69dc5b385a3db2eb3c1115f/xotomomiwilabi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e4c69ae7f9029a34c83f5ad86791e845/80118394339.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/96275809649.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e184f5e1c9b8683064dcf199c55a923/91219713746.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6608e87b91a34ce7cdc1828819ad8898/rimadugusofiwepanovit.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dd20b04c---6508757002.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098610e982e1---zamarage.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160767001d6ed5---tamekixokipudoxibosof.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/vixadokume.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6cd5e4359---dorutawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 5372 bytes
SHA-256: 24d527a71672f96c5e6e8d8c14a1e8ab270573f2c5a9d4e258a3ffb5d892a8c2

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