Malicious PDF — malware analysis report

Static analysis result for SHA-256 33752c54f91a6327…

MALICIOUS

PDF

88.5 KB Created: 2021-07-24 04:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a0d9db615bb8d364bf9e96fab3f05633 SHA-1: 82f49047ad9e67ecd1f2d7940375f566ff70509d SHA-256: 33752c54f91a632762f1588df3045754d925369f94cd4242a0cca9bb226cc4c2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised WordPress sites and potentially disposable hosting domains. The primary goal appears to be directing traffic to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc241ea211---jenuvawibebanel.pdf In PDF document text
    • https://kermiradiatoriai.lt/images/files/lujewimuwogoneg.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc2293ffaf---forefinafadelafukenul.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/45f1ead847b75b28019f3f39701306f9/50230341210.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/30348061820.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885ec947e97---dopobasugulipe.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/pegojutupelufalexokil.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c03eb1194---zidorezemefapikumuwovuva.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cec142c260ac7c7d29a4b0c0664b9578/fowuvefopiv.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ec13f4942bbc09317c2482a37bbb0507/36921365446.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/74544665017.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097244646f9e---30258496151.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/18946135697.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c566c349b79---fujigopek.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/95440675766.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ee23738d---96788602839.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7ffc897be---kepekafajijobaza.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rajidopisuxazo.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/visadi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd375bc810d---25401692345.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/61c9a75b16586acbf42ae1db34f48506/85560101649.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/509l492fb3i4gq294302ehmob7/nutijidezejutazirapipe.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b27934ce3bc56f776ba3d0ea90c3ae8d/rozibivowa.pdfIn PDF document text
    • http://martonelektro.hu/files/file/25793892989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+flashing+heart+symbol+mean+on+blood+pressure+monitorPDF 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_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 17068 bytes
SHA-256: 6aacf0b2aac71db95a108402a62d69a5f6266eae8007ec2e4b2e3906a3c77c67
font_01_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C6 11292 bytes
SHA-256: f14e122aff8882c2c4a3407dcfcf093b7f7435dba1e359bd7bf0f88ddfb041be