Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ac41cd3834aec6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 12:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06444b091fe9bb1c125f3e8f26e709bb SHA-1: 38a42f2edd7dca1f44dbc9722209af3be9680e30 SHA-256: 95ac41cd3834aec6b29be2968e635830284855cf9f3d56be6b9aa3edc0e20ba2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The file's structure and URL patterns are consistent with known phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3bb985ad15e18f3a201600fbffeaccdd/67574689800.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a32d279deb1944840cb489386ea18bc2/74250112398.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/visogeminojedamunonitujo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b80d74cebf0c201badf61ba2f10b5bdf/75040038419.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lbdmmdn3dq5lbm2stiq618v041/kufuziramurejuxip.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/juvefofalikoxipirixij.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/xijebikiliwipetana.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210803072852.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/23834523701.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/58635386433.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8d33c505b6fb6180652cbf3617fef22e/8911203303.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d30d0a7f2fb---wefapuwunusiloxuvuzab.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/tosulemizavikunodipol.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/53423136638.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/29616910097.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/bawenigowilatuvanu.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7731ef4e---27242679542.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e98c6dfb---34985671902.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09a2d3f89---kumew.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/ropafozo.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/kusapegakadup.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/nirafuvimixuxa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fec9466c199a4f8e724ef147ffaac54b/ropaxakepolageduba.pdfIn PDF document text
    • http://thaide.org/userfiles/file/61212005912.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a19a651f---buletoxetixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=factors+affecting+quality+and+quantity+of+milk+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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 17588 bytes
SHA-256: 9e8155f267c2bd2ca2b22f7d2abe57a71a556a9b26175b2076bfdfc44f6dbe3c
font_01_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 11392 bytes
SHA-256: 151a553797377a183c46deac55a44e0230ca04b074d7b5313298fb1bbf5ff956