Malicious PDF — malware analysis report

Static analysis result for SHA-256 2832585a95ab63e2…

MALICIOUS

PDF

107.9 KB Created: 2021-07-27 17:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3bfd7d7db127e45ac4999600fafc5074 SHA-1: d68479e0bde9242a8fdc4814c823765360c3c9af SHA-256: 2832585a95ab63e29988ec14ccd566a2998ca531d80dd3d32ffb76c6418508e7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of numerous links on disposable hosting and the use of UTM parameters further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609080f0aa67f---xenes.pdf In PDF document text
    • http://www.cddfct.com/up_files/file/95953518534.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728913e75f5---pilabipafupetadiko.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5bbc475c5---forodegetepurikirixel.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/diburulav.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2daacc980e0313d8940cf296341a1389/mizuwizakoliwonumuze.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/420e21a78bbaeb345c124b1b481d2bd7/katomigego.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/63000554709e626913e2efbb90715491/nizowugozimeze.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984098985f0---51055702092.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/dawutufutodezofisut.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cded1a3c8---10749626695.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e05430qmnrlup8ae9ds6k15ioj/dovunezuveg.pdfIn PDF document text
    • http://lawngo.net/fckfiles/89781482101.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/1bd1db1112dcc69eefcb1abeb8bcd1c9/piratumuwoduvev.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/83008010690.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c05c723cc---96220116677.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e278af50f---86108989879.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160988e6130d23---mazisosofolujitodulir.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/47623012901.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/nugazavanomuzafes.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/49953989435.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/d2m181q27egbgqgtm5rr56dhvi/xifozalazanunusija.pdfIn PDF document text
    • https://yuss.it/file/29241526946.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/korodakiw.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078d43589ee1---541628224.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/zitimub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bridgerton+netflix+showPDF 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_off00013faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAF 18332 bytes
SHA-256: d2deefbea923f57ecbb8482cfa8b5c9e310faa52f9bc742358055472fef7fb03
font_01_sfnt_off00016ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000186d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D5 10712 bytes
SHA-256: 4af5bdf9050bc12a0c4fa2cc7071dc29cc8771618b7d66afcbc896707cd67534