Malicious PDF — malware analysis report

Static analysis result for SHA-256 50729f5d7db84c3c…

MALICIOUS

PDF

110.6 KB Created: 2021-06-29 18:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4415f8921cac95b93896b79967962d3d SHA-1: 0b614518c8301ab5239968b0628e26e59289ef16 SHA-256: 50729f5d7db84c3cd8e544261b76f8e7f71c177d0c93a42948fd476b3bc569c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6b1c052b3fc7e057d335bfe6d95c76d3/ninotogopina.pdf
    • http://liavanhaeringen.nl/userfiles/files/meduxovojup.pdf
    • http://jun-travel.com/userfiles/file/mijetimetedebalu.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3ubea6ur7t54h58uffolpk73r1/41337585622.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6e600f60---jirojimulogag.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608d90457e2eb---davelinot.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/jitirejebuwepobujiwoke.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/nobafagobatomuvezuvomov.pdf
    • http://absolutelyneon.com/userfiles/file/fugunami.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c029d867---sovelababejesonox.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a49af92f09bf75af3416c48f51ca61a6/16840245535.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074723b6d92c---totujategiperulefusosupol.pdf
    • http://medicapoland.pl/uploaded/file/koragabapigugabisovewirol.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/fifajopoderejavufamu.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/270a6fbc370f2caad2c1a7d631a76a45/rujepidalaselesi.pdf
    • https://baobihungphu.com/media/ftp/file/42906071451.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160839b5501e81---nifodiximomujidazusubana.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3qqv1lg107vas6kropqavc4r64/xugetolitasejugepikaxeja.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772dc64d2bd---7674383443.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8056ecb040---54564301513.pdf
    • http://files.ibiza-ferien.de/file/ladon.pdf
    • http://dzbnf.com/upload/file///92516916383.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/27ab6ac26c795edb1648cd918a17c0e8/44984941588.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/54ba38ed17b201f85339e7e137cc6268/10907088164.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8d9e64fc11284fdf8c811992c7b10cbd/vemusijuxajuge.pdf
    • http://skonasystems.com/userfiles/file/vejoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=famous+norse+heroes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c49.bin
d334870998b4fcf88b6dc3be6a3a87f7b1ab4471963253a65380c34072a72daa
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C49 19788 bytes
font_01_sfnt_off00017e52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E52 16792 bytes
font_02_sfnt_off00019669.bin
6937dc2449513097741fdc279301b666faa3f998064723bcbe9fa4166fe4b183
pdf-font-stream PDF embedded font (sfnt) at offset 0x19669 10216 bytes