Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecadc04dd03e820…

MALICIOUS

PDF

86.5 KB Created: 2021-07-30 05:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 386c5c87aa2c644d46485220c8986c14 SHA-1: be5cecfa92add1a2783386c802cd7ca298859225 SHA-256: cecadc04dd03e820e1d9858b586a7b6689ba03b9ee98a1640ce79cf72881edff
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting (compromised CMS, disposable domains) are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tramtron.vn/uploads/files/files/34615796546.pdf In PDF document text
    • http://gyobel.itpublic/file/72444263379.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/taxunaj.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/25995866247.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mgjo287soeusnbs2r3hglc2kbm/panali.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75686d87f1---14325478598.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/ninepudepumilezibez.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/68476777237.pdfIn PDF document text
    • http://mousike.it/img_ins/files/10906418354.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/7228591759.pdfIn PDF document text
    • http://e-district.org/userfiles/file/10759346841.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a935ed66b65---65818559807.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/50997892333.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a480fbc182a---60633217154.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/c3fksj7aukop0187csf993ovqj/batizagozelugoded.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/2pola14r12t91mb20pv04t885d/42344581042.pdfIn PDF document text
    • https://bor-diing.com/upload/files/tifakufozonefexenezux.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/20628507628.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/tikureduwituweju.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074034742e35---bibefefojevisopafaxofox.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6aae84f36afc48e6ae07eff673494b53/xowukavorefa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53ee3281f---wodosinelubatexu.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/denajidumuwiz.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/22603029007.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/718549dd7a397ab7f48b9430aa74b3d7/titofozetuxipezuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=descargar+examen+psicometrico+gratis+pdfPDF 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 18324 bytes
SHA-256: 216ac4a158db90032a91dedf06c7460d15215a7eac99d09028210a5b9d46d174
font_01_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 11020 bytes
SHA-256: b715b277da4686057e53907005bb93f650cabf1cedab9ef3d8fbad4404c011cc
font_02_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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