Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6361e773b90d48e…

MALICIOUS

PDF

96.4 KB Created: 2021-06-28 15:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 129b4e194ef89e300cdad3a7bc8fcab2 SHA-1: b555470a41fd7be27e862231af44ed7b1c4b9a5b SHA-256: d6361e773b90d48efec2205a2bbe72f66188f529236045eb076fc314bfccaa4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The embedded JavaScript suggests an attempt to execute code, potentially to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/22326d6528d5484be87579f264d30719/88755273643.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/82d8e8f522c37e0c0119e4a02cdc6ae3/zajorafisafugeporevevutu.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072be687f9d5---bozetimusu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ee370666b46a243ca7919a5b0962315a/17860564440.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ee034a252e65006728d2af32189cfa4/42518734001.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f40c2ae0ac4b0c512c318cb007196d8a/buresun.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d230e57e021---jajigobez.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/nrcruevbgite39h8tgh3r0j594/lejironosebewenosoli.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078734131847---87217080885.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/83c36d58d4b537f39c549764d1475045/69951439414.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/20111747018.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac284f65147---fesilefixulokopodu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78adad88bc---feremewo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fovvouo0o5jo5v1huvbhkh25ts/9618057780.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3a3720f918df9d48f3c267520984a754/bobinuverixap.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/32856810185.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/buvovoviz.pdfIn PDF document text
    • http://maihome.hu/admin1/file/65740816463.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/31534997054.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/272960e5647f96560461f8f3a48cea1c/volagunapopu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9908f71a9a1d6c1c9959699446510d4b/minarolana.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/nadenuviperodexuxaza.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e0dcrf7ub65jbkuhn21f5jq4k4/23639846010.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/tarupoxevide.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/tolidaxujano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=funny+valentine+memes+for+friendsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 16904 bytes
SHA-256: f623a6840df4c1a98afbde77c9b2d884f8e0f39a277a9c049ab6bd1aadd39d3d
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 1728 bytes
SHA-256: 3e54697433f258519e59b5d4193970bd3702f67e639bb31f2dfcde737eb7fc9e
font_02_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 10772 bytes
SHA-256: fb75169d68d99f52716e57c03071b9bf84e765ffa347293615680ec4ed97961a
font_04_sfnt_off0001435c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435C 17704 bytes
SHA-256: 2fe5c6a0c55203bbd5c8e5e35332f5a59fcc29de935f02e7c3c3f7f772632a63

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