Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a399901e468281…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 05:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f81abf3c91463945154b5999a76a01b SHA-1: 4a1d10ebe651d85d00a9d57dc3f6395d77da5c54 SHA-256: a3a399901e4682815086b54b55343101fd851368d56efd865558404670141426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO manipulation or malware distribution. The presence of a URL with "10000 free robux" strongly indicates a phishing or scam lure. ClamAV detection and ML classification further support its malicious nature, likely as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://bainihu.com/upfiles/editor/files/wukuvaz.pdf In PDF document text
    • https://lawina-radom.pl/files/file/bageduzezal.pdfIn PDF document text
    • http://esen.life/userfiles/file/89102269515.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/terofiwuzekowolomut.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210902_11214EB51E5FEC3C.pdfIn PDF document text
    • https://fratellifurloni.it/file/55626452841.pdfIn PDF document text
    • http://webbuilders.com/files/file/64695662226.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc52781ea---17553404597.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/dixesa.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e8566cad---sowokuwuzinagosuda.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/likita.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/jefiranozoluzatoduxure.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ad0fccb30093121b631ea6a2537c933/95249549946.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210905224235.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86a872db3---24078593709.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16138621d89471---66885506288.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/17889567657.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/fonujatufixug.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/12292769987.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/76266068847.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/soxuvuvegitutapeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=10000+free+robuxPDF 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_off0000bda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA5 9956 bytes
SHA-256: 8de54658ebe066b2f77227daa78099c21db4ee9445a9611d030552a2a53f58fb
font_01_sfnt_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 18128 bytes
SHA-256: c3ca4cd67cc33a59199e04680a0c8111b60aaa6aef2496fb0295034aa118b6c7