Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fad4b062933c4f4…

MALICIOUS

PDF

88.0 KB Created: 2021-07-05 01:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a0560253e84ff6ba866a60a565df8b51 SHA-1: f2900c4115a54bcabfbee680419d48da4b0585d4 SHA-256: 6fad4b062933c4f44df4e46a61ce42d47d878108d25f791f4ef26dcabe24c87b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings point to a common tactic of using compromised infrastructure to host malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • 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://pistant.ru/uplcv?utm_term=stomach+ache+and+cramps+after+eating PDF link annotation
    • http://multi-accueil.fr/ressource/site-image/files/45021948301.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ea0ee7de---wijixutebesumawanota.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070720e2ed4e---10431750755.pdfIn PDF document text
    • https://songhong.info/userfiles/file/wibekipulisujovenuva.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/25sf8f1llfkkgtj4njua4jlc46/nutilomulubifi.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/93505047220.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/lopejewumumasok.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c777bc8df43---zebebivobe.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee9f062840aa49c819f71b09f5d4f285/motudogisego.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1c8ed6012---gejagimepusemenuru.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/812784567635cb06dfdbc9ebde402ace/rukefixurasid.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3605957d4---vidimipufavetoz.pdfIn PDF document text
    • http://landbondcorten.com/attachment/file/8df4ca1d2d9cbb8292c1e2775fcc2b77.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/poladulur.pdfIn PDF document text
    • https://faprosid.com/file/91777740394.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160787f0eede5e---98107326212.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab0220225---zogobivimonolafigeretiser.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ea3f7afacd572b02404b4645ad3731e5/2273240796.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ce3a5c64783f9748666540105f421585/70131649951.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/h50ec72t0ak2shtk3vcbaiv1pf/vefidomokaletu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/3577053446.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 11096 bytes
SHA-256: afc5bbc31077f8dc4a0e54bf4da75c1e06d02ae1969e12e08eca4b5e7ec54a52
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 16940 bytes
SHA-256: 8f85ca02df97d7ba82680a1f055dadaf9efdf8f2c9e2dc1dabc801bfae953a5b
font_02_sfnt_off00013ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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