Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bfa89c8ae15a54…

MALICIOUS

PDF

58.6 KB Created: 2021-06-07 00:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9de0e89d078187a046f55fabd9f7a7af SHA-1: e5428bf521e202bb20ebb40ba8442c6a67379ca4 SHA-256: e9bfa89c8ae15a54ad5863bb07388baf3a2150056dd533380bee07cbf892bef6
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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://crewmak.ru/uplcv?utm_term=how+to+calculate+compound+interest+example PDF link annotation
    • http://strandedtattoo.net/file/zagazezipavi.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/mizuxaw.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2ad46b0490dc753bd625689e93c9710/41312740445.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3fdc91fa---26122732718.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc95d3716---47725697457.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/65cd660cfbacd21a291dc414acd51adf/33237028939.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/61215788878.pdfIn PDF document text
    • http://prestopc.it/upload/file/56752602681.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/dosawotirujiwodizaliva.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/463981466464f53a45f382f57cca1e6b/65256323441.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/34709143715.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5c5c826a---jupewoxuwoxosigatorudo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2de603e219721275b3898a84a1b5e304/bedimege.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0rmlv2phehp691fg7j4iend8l7/sixada.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ef7urn6g76rjnubflaim1ccgoj/kimutixutolibeva.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_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 5340 bytes
SHA-256: 0d58776930435c7472c548ae60a0f69cf3279eea75ef4e36783b080825dbafee

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