Malicious PDF — malware analysis report

Static analysis result for SHA-256 3024a096183cdb5e…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 11:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc9237cc6a5874cace9355913edb33fd SHA-1: 951f03069f0c8f8a450bd5984e4bd8fdbed81bd4 SHA-256: 3024a096183cdb5e98ece6ac26080cc35c495bd7a339ff9d322b0b14cfc4094c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://csaladiegyteruautok.hu/userfiles/files/kudafuju.pdf In PDF document text
    • http://apmnir.ro/fckfiles/file/xajixejuzeruxeradi.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/levuzixosalejadim.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/25304159619.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/44989511949.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9923be9a7---lipinogar.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/moridekafetu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8a038f4ebcbfefc2cbe1c8fdd09f6ab2/nizimalup.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138799a9943a---99454801003.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/kemaluduselapulap.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/20260982042.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/fetajipige.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161425b3c7fa22---bizusujige.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/26117622338.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/mepakederuwejatik.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/fifekemudapagu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/74973716971.pdfIn PDF document text
    • https://alpinashop.bg/files/fopetubobijibozojetodonaw.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/bugamuwitafixixetak.pdfIn PDF document text
    • https://plasy.com/uploads/file/66843784600.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/fetebigezolile.pdfIn PDF document text
    • https://casaalu.com/luutru/files/30658368590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=grocery+app+androidPDF 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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 10348 bytes
SHA-256: 440256b981d08264b9490a58c9ef1821621029d83af45a424d03d3b1d37d5e5d
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 17672 bytes
SHA-256: 9994f2f4351b9fc1fa66be3690d751fffd120c874b6688dd02675432bdf4cd50