Malicious PDF — malware analysis report

Static analysis result for SHA-256 75921dc03c10af2e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 04:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac6f6b59e6ad7fdf9d9b77547753d754 SHA-1: bd04b417404215283b9da37f724f43bba8303ba5 SHA-256: 75921dc03c10af2e91f902ca9af50e2db655d5afb0fab128ba1c9643f75677c6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aarogyamedico.com/userfiles/file/67118227848.pdf In PDF document text
    • http://xn--eyt274i.com/upload/files/61314091372.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/naniravazuruwu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210526021736_618757387.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee1e0ab77---22584314735.pdfIn PDF document text
    • http://mousike.it/img_ins/files/86788954652.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160871b8476b00---nifarevuzobibisom.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/nunesubufeduxuwakowuvipa.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/1a3b919038e123a53d96b20567b7e73a/wejanida.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/99069638485.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/li5gpsp5ev7qsmv2cdo5krb2s0/80477455394.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/35207826241.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/76hdmol55lot00q2u3pnp1uqe1/33809882284.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/t9rv007vgt5e81fdo1ufbam79u/bemat.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pk9dd8visk95joosoaofdlg676/22634534556.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/51d0305415552136b3715b65bb1a2d6e/tiguzak.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fcc87a41b---vifuviwisosogupefi.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/7177132324.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/gudajududapeto.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68935b9071---66535316166.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2017c7c6be---nebikazolasun.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/gewezurur.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/39811963181.pdfIn PDF document text
    • https://red-adlay.com/upload/files/bavidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mengenlehre+aufgaben+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_off0000bea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA4 10532 bytes
SHA-256: 19b4d42b901753b16f01c027505e3e685d6c06d757830d721113e63652f2fc57
font_01_sfnt_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 18384 bytes
SHA-256: 6ebd4c9c8dac6c2199e62e5b5c578cc004aac865fb0cc1f9a1467fd1e2ae755d
font_02_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1