Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68dc9ddf88fa960…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 15:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea680ac9155429df12e31f8b86d110fb SHA-1: 7303dfe79a69a4d612177b65254ec506f55ec167 SHA-256: c68dc9ddf88fa9600842996f47e6b716c312a0a39359d9c845ba70324265dff0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The presence of numerous external URIs and link farms points towards a tactic of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/shspp0viud99mnvo3eq3flrvje/89999537978.pdf In PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/9899040469.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cee94767d56d5459b561dd3f1e3744e7/55612911304.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160854c5ba122c---71754398689.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/e250260be9e40d1fb2ea788f7773a0fd/samedopodegude.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787142f06b3---vadasid.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210824_6EA8B25660DE347E.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a634a8385b---31405637362.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/66194924999.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/dasibi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/11e12b9c5fc1a7a0ff0805aaf0b3db6a/85857958490.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b13d03e507---72446388201.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j57tipubctmjv8e2915ha35r5i/14535019486.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/7de8d1904f4ccb37387a5e912ba6c5e7/xunegexoxijisajek.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/xiwisopunuruneximawil.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dn58mvg97cnlf2jert7ceg7oon/59274768821.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/78341505943.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5cd72e462571ed6502ea334c6eb90483/zapobaxukixid.pdfIn PDF document text
    • http://watch62.ru/files/files/76904373000.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fb82e778f---koxesuko.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/242206528280.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/93974911134.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/29871435537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=calculus+early+transcendental+functions+4th+edition+pdf+downloadPDF 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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 18316 bytes
SHA-256: 0db1d45589356f30aa27643109cea0d95351407eda6469cf87c28e07482f10b3
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 11124 bytes
SHA-256: 201634a43c25b913a42136ea78970d8d2a40056dd8483dd01422949506fca201
font_02_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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