Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f287029f7c5c6d4…

MALICIOUS

PDF

72.0 KB Created: 2021-06-09 04:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e8a009ef483a4cc11dec1a0379fb5851 SHA-1: 03ea234339c006f979b84a293e9a2d9da5fb99dd SHA-256: 8f287029f7c5c6d4965f5cea96d5674384de95848c03b4784fc08c952abd5c87
94 Risk Score

Malware Insights

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

This PDF document is classified as malicious, primarily due to its function as a link farm pointing to compromised WordPress upload directories. The document's content, though heavily obfuscated, suggests a lure related to a "hidden call recorder app 2020", likely intended to trick users into downloading further malicious payloads. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9316

Heuristics 4

  • 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://wastran.ru/uplcv?utm_term=hidden+call+recorder+app+2020 PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083278a208ef---12430129477.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba5210da3---76223334896.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/jimixonewodopa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7101bb40---kodunobemaduvudunowelopub.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff28de21d3---fugisazusowuvixazuzem.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/af42538414980c23769dceb3d8f8cda9/vigipufudumel.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/74286397596.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745106906e8---ribexiluwusanumunaje.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n62i5di2v80c8rkaufo1523j90/8444870678.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/cf1c7430f8977428d47ec994539ffde1/70299608568.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0v6lkamo2vutr4fn2tlsb049ob/noposasitesamebozo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf576bf0b6---46011919587.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/25f957c05ec8402b33e4c1b13070c200/nenan.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/70c5a7d686f9fab980615d6b0e40a426/64328178699.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed0c0fc05---3347398231.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/7799721673.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 4832 bytes
SHA-256: cfc1aa9a6ddea120cc8dcb4a8b3c433924246295558c53ac51e2c8a1585b0ab4
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 10204 bytes
SHA-256: 4a0863820100c5922368d4a5679e299789fb755ecce53119840a04ea4311da24

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