Malicious PDF — malware analysis report

Static analysis result for SHA-256 89528e3ff5b7ffa3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 20:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91f505ff9633ab6533ee4b68345489fc SHA-1: ebbac55f46bb7fd3e5aed64b9873ba46c3eb60c9 SHA-256: 89528e3ff5b7ffa3e1c40eae4f7ddf0f2619caa3eafb196121a104f93cb6a4ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further payloads or leading users to phishing sites disguised as download portals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=doctor+strange+full+movie+movierulz PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b7989e37---30709822537.pdfIn PDF document text
    • https://wecareprogram.org/images/file/8172098192.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/kizaga.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/74683675152.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/lixitijoxatosovamejag.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/maremewi.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/71618908127.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hma4voop36cuvpmhush470knn2/barelipovomaj.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161448265e8ed7---66019368171.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/99306685592.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/34507907496.pdfIn PDF document text
    • http://czyxchem.com/upload/files/weruzimabimegezijawibi.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/wuleradiku.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/55580881227.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/8809398673.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/7683822426.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/wiwixobetenejo.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/28479786087.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/77914338304.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10cba745e---14908202599.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/gubidusisoraxutarofawepux.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/148ce6cc9db84ab31a77a6acff300607/risugudegimuwig.pdfIn PDF document text
    • http://cold.lt/userfiles/file/70225730908.pdfIn PDF document text
    • 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_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 10904 bytes
SHA-256: c39802cc69e3aafd17f5b40d42cf942802cf78067eefca6943b4049969ac7ddc
font_01_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 16856 bytes
SHA-256: 8a1f455a07bfafd35382de33eae9445f626c59c4a54958f49f19f200c43ace57
font_02_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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