Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fffcecca67076e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 09:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d67b41fa9c0ea539110ce24f7d880912 SHA-1: 07a3ded6c3849a258a6886b2232162267414de99 SHA-256: 91fffcecca67076ed7887fe16e4868a3c8149a18001f58721d27e22289d6b532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=hydraulic+ladder+mini+project+pdf PDF link annotation
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a4fc40a35e0be89d5dda5c934b2d00fc/novuzaxabojogutaxu.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/neberadenebofisa.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xadariwoguvudekemizodukik.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/17962245810.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/s5k8hj2ef6cjhnh0k55urj3b4e/wisakasike.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/dc532f3662d37f7cfeb8e4c40bba27ce/27264744378.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/72848433504.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/8272526511.pdfIn PDF document text
    • http://pmke.cz/pictures/files/vikumabozadiwi.pdfIn PDF document text
    • http://ibb-online.ru/f/file/88745636058.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/56868037067.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db5448a1ab932e16888ed6a21ac93389/kufisutixobudenuzitoto.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e26c6576d43---4934898669.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160831bba41153---29671227321.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f82fa5af35e---91618701906.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210716041748.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160839104bac13---kejotixol.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766af43d01d---sibosakonixopanuza.pdfIn PDF document text
    • http://esistore.be/userfiles/file/lakokijatofopel.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/82457957579.pdfIn PDF document text
    • https://kede.org/userfiles/file/25357764134.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/vusebovak.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bafbc6babe6---soremovalotuvadirekob.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd4617ae4---letolozuliga.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_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 10948 bytes
SHA-256: 271dfa4e4be515a309524b10a4be7070e88eec1bec1e2be4aa7395eb4175c226
font_02_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 17900 bytes
SHA-256: eb5d08e4f7f2b6da02f089eddade0904c9af2ad9c248639898b6ceb78cac2577

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