Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4cdfb4699c30a6…

MALICIOUS

PDF

92.3 KB Created: 2021-09-02 05:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b5349f01efdea2e76070f69540e2648 SHA-1: 1d31806a769b7802a41b52935cb6bbb90e32ad6e SHA-256: 2e4cdfb4699c30a6371932bb6d1249351ff2c3a273fb8e90ee817e9defd0894c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites. These links are likely used to distribute further malware or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e97097791---51455681491.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff1be4ae0---rerulakanizovexun.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/41467336823.pdfIn PDF document text
    • http://boxethai38.com/upload/file/kakifodajunuxak.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da76077dfb---futunuzojolefesonan.pdfIn PDF document text
    • http://zzquansu.cn/d/files/90244360424.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/20767756583.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/25836449313.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/65669645547.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6895535029bc7219acb13ced8a579351/ginuserovifan.pdfIn PDF document text
    • http://iphysiology.ru/upload/83372807577.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/76886394600.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ed23fbd2---ropof.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/16040965957.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/79178400781.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c25fc651dc2---21270851691.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf37aaca28---74032557410.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88cdb603d---tujudukelixugalapixabavi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86c4e9dd5---ziximiwuxovine.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/xoradafoj.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/5941277855.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/44461944021.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/melolunifozitutijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=god+made+the+universePDF 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_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 17336 bytes
SHA-256: 27b66ff394f32ca775e32bf9fb2a7243f9f0a50583d683da202fea125ea694d5
font_01_sfnt_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 10672 bytes
SHA-256: 9d2e8552de9a94441431a28978213574b7316f72d38893ba5bdf5c8d2d719f1d
font_02_sfnt_off00014a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1