Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5c04f01140bf11…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 19:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8a21dfedb45919df9647fb4909ad991 SHA-1: fd61b1d6bbb5d92ae4cf4b73f8841112d3638d6f SHA-256: 2b5c04f01140bf11794548658f6100b4b6d6ef9f70b8c183be12d91ce40ecfb6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple compromised CMS upload links and SEO disposable link farm heuristics points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thelonerangerfanclub.com/ckfinder/userfiles/files/92062630771.pdf In PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/40868161921.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e8b877b52c697be6dd0cf81e07f862d1/214340800.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210904235721.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09140b089---65384233547.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a073c7da7072e7426c7b5940d60bd553/39342146301.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/rugasorelapa.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/tewametuzosuwiteke.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131dcf49a064---teralifakukol.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zipodefepifewagarasir.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nuguvogop.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8690628e27b3c01b7c2007b71ecbc0d/54903816547.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/26697416369.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/89684867172.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f203fb6dfbcc5958fb95379b19147179/budeli.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd3422a808---59919084026.pdfIn PDF document text
    • http://masukpt1.com/contents/files/37249855890.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/ledezupalafona.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613240ce179ea---detaserama.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/vomowojenu.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/96646440178.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/88084201255.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/78071427761.pdfIn PDF document text
    • http://greenbrier101.com/userimages/33076315731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+emulator+in+web+browserPDF 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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 17988 bytes
SHA-256: edfa9088797b89dd7a2df830c308d6def3c86ee69eba094ff7df129ca24512bf
font_01_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 10716 bytes
SHA-256: 595d6617f01608ecbb635484594fa863e49d960cbeef922f9455e35c94a2f1ca