Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b3bc0d49ba9e27…

MALICIOUS

PDF

71.3 KB Created: 2021-07-03 14:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 805f427ae55a28de900d10c3d4e997ff SHA-1: a2653f561e92dd444c1ef77f8ef5e6e5fa837af0 SHA-256: 85b3bc0d49ba9e2775443337c92a3ef0141cd66ba6771fc9453d73bc706d94e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful sites.

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af967fa2cd1---guburaneveni.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b066c1bbaed---wifolezukexepituxopax.pdfIn PDF document text
    • http://beateromer.com/bilder/file/20521064566.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/nobizuwobafew.pdfIn PDF document text
    • http://kasargod.net/uploads/file/19443020645.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7tur0kjr6erbshmpuminqard4u/rewizawoposajowivi.pdfIn PDF document text
    • https://noddy.nu/images/file/sesudukadejagapesuze.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831b79b9890---zufewusoxiduselopukuwo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9929d4fa219f1f0668c4c782a207b19c/bagogupo.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/powatigabelu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/162a575819297f22318ee6856fc97a87/87690672.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/bf652ddd8d368499502a118ef851f63f/33984646613.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/4803677887.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9146196864a1ec67c5658757b66acba9/ledagesoguj.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/gifuzutepadeximewodad.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160843a4051191---dewofovulatuwevidazisewow.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/47099247300.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b6003f7304277ab528f258a6dbc654c2/40981312721.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/95427090362.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ca63e23a---zulosaforuf.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/zugonanitagupibi.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/92888857938.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/rifetuzasalununemifudix.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec3a04f47---76340134197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dribs+and+drabs+synonymPDF link annotation
    • 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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 10388 bytes
SHA-256: cf78a26afd8c53149c81d16daa2fc660445b3e3df33d80fe8f3e40a5315e80f2
font_01_sfnt_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 15808 bytes
SHA-256: 3ed4d3cf7bc6525b5fd1b45141b20b1e91eabdd85f11678508713256cb63dcac