Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86de77858b6eacf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 17:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c607315d7a54ef075c9bad23308fce9 SHA-1: 70f6187eda37301d9c2d306390f8187bcde4dc9d SHA-256: a86de77858b6eacf6b323dc08ca869816114c44b8eeb1d059ab4446cacdf67eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm. The link farm points to numerous domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of embedded JavaScript further supports the malicious intent, likely to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://drafthe.ru/uplcv?utm_term=android+phone+wallpaper PDF link annotation
    • http://studiofantino.it/userfiles/files/91362220253.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d03f9538b5---72409896921.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/13284346400.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/91812843348.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210907135337.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/sajokefeku.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/69518601875.pdfIn PDF document text
    • http://www.og2c.com/images/file/89139621173.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rotexusutizexov.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/81349674731.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/zoxadolekezuraz.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/noviwitewetijemakafuloxi.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/8209734907.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/sokilizinubezosevux.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/zazekizawix.pdfIn PDF document text
    • http://ibb-online.ru/f/file/54439408134.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3255e5f14---92902047243.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ce7e582e---bivuviw.pdfIn PDF document text
    • https://krusomying.com/data/file/xofasuwivinivugiw.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/kopibuvepodaxibamik.pdfIn PDF document text
    • https://fuoriscena.eu/file/govexugonadapubi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1456bdab7ff1d19ae6d42e7fbe6a2e1b/47392830405.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/favidiv.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/24fabb82a4a56f7668542712e40185d9/supesepom.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/daboxeditenep.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 17620 bytes
SHA-256: 0e2d90ad1fe5ba038656060873f048d7a24cbc688058ad884d4e4e159edaaa4d
font_01_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 10292 bytes
SHA-256: a44015c7141621b0273b390745dabb78f2f2c7e9372364d1bd83d110cafb818d

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