Malicious PDF — malware analysis report

Static analysis result for SHA-256 8443720b0689d088…

MALICIOUS

PDF

75.0 KB Created: 2021-06-27 22:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e6c6a766de414e4c6d0aa085bc4f0e34 SHA-1: b879c560d443167535ea3d2460d738164a4ae54c SHA-256: 8443720b0689d08801e2e117c1045b9a413a2b9462565588957245ecf584a048
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7617

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://chcial.ru/uplcv?utm_term=persuasive+essay+on+texting+and+driving PDF link annotation
    • http://topenglish.sk/app/webroot/gallery/files/48273882623.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160950d8a4d4fe---zinaveviduz.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb6e615e0---gofafokigalupumisuka.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210627211505-jesafelova.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f02407efb---pijadurote.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6864b17277d89cfa2462f76cb32137cd/56667513743.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e29108f414bf16f5a8bc9b6718e696c9/2474450157.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea8ff25e6---69377631829.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/9f946048b10d2703d993a9c3a6d4ef81/duragupezepekovuximuze.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/2274086231.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pagurawulem.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bv552lsklp20j6jt611oed3b73/kifubaxipiwis.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d32750e4---nosesagebejeroko.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a31226efb8f---55666746509.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/zevaleduwewiguval.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 10760 bytes
SHA-256: 28ac2a2fdb7e9db073319ab84ffc4a985c1525c83b7fc91fca4ef0101cd3064e
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 16652 bytes
SHA-256: ab37e7a3ecd059b2ab7a94b1d502f94ab5056b1db909cccfd9add477dbb491ae

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