Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd349c0ea1b28c95…

MALICIOUS

PDF

93.7 KB Created: 2021-06-30 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 67b6152489cf3e6648d358455195446e SHA-1: a53919057c0bf2cbdfb463b9519148c528c0d85c SHA-256: dd349c0ea1b28c95e2f319aeea6407ff4bdc90756cf1fba513e83938591004fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these compromised sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2svem8tvhc9dvvrhne0bomitq2/96331098007.pdf In PDF document text
    • http://harasim.cz/uploaded/files/12509288737.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/34899056295.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4gkv7gnq65bulk5n2am547pttg/nureso.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae67b739849---1241908324.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/37583625758.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/pikataroxotovukew.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607400014bb5f---rudevegajujaj.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f8266ee2---xomawapoxuxujoxevemokit.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052517341373499.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d6ba67d8f8e3bd7e2001c56c52de21da/9864564380.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/11626763080.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/i6tbvl4hrgoci6mgcodjk8k1l5/27135279843.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29aae020f3e6648473b32e312e20b92/89555152684.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/70380508127.pdfIn PDF document text
    • http://atya.eu/files/file/xavugerera.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/gurusos.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e424f210---37406031151.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8648b382e---penukojosimera.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/63a6124f0d30b9e946055f169c83719c/60919995295.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/tajodewovozon.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/oalsfehlm3ltvd1fg4hfg5l137/59959194848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=equilateral+equilateral+trianglePDF 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_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 10224 bytes
SHA-256: 9ca519d6e0c8bb982459c34f2f6145e32ef1b0ec608d0a343f8381739e7897a7
font_01_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13748 19288 bytes
SHA-256: 1accd58811400f63eb286a6a54d4d79a7ca8b1fe74dda3f8ccbd55c72a0c463a

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