Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eaa8c4c88c3fd0a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 11:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8559589b5a1d02c54a25a0e5c39dca1 SHA-1: b94d805b431b994495a4b1655c56b25069d9f617 SHA-256: 5eaa8c4c88c3fd0ab4999dac06bf0f914b3ed98c8d851941e4e9735e13aa759e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links point towards a social engineering attack to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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 http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c34c8314---jiwibudo.pdf In PDF document text
    • http://tdbm.vn/upload/files/mavugoxikefivi.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/tadaxutufetapuvu.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/48090837112.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c53e29bdc---93611498981.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/jenoxojitaxapilojolotebi.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/35791998462.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3acf0fb53---silejovivagu.pdfIn PDF document text
    • https://ottopianos.nl/files/detoxomobetufudipajifili.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/24827737846.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbf04e6d17---lipapot.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210826075633.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/57829227966.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/12247672890.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/99019812216.pdfIn PDF document text
    • http://djapm.com/userfiles/file/83242425899.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/wixidaberivun.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/zidudodoxuvimibipajud.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/ronobimovusakuv.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/fad5703b76f226cd2b8e72fc412fd55f/zefilotetomipaberirivodoj.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/30418682253.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d64c5dbaeca---92697192369.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/sinoxirinamagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+dictionary+english+to+arabic+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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 11240 bytes
SHA-256: d40ccfc981d25d2c5b7981f992bb3d2d0eea7a2c5dc8c02ff4475e715f246608
font_02_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 23060 bytes
SHA-256: 1c9adb47a41fc581a2ab940d467af801abd7ca30c5eaf45e0342f44a012bd4e4

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