Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e50ba17eed16113…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 01:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8cb33da29d78676e81b7135b02fe882 SHA-1: d7d930138541f55635cf27ca4541fab3827aadc9 SHA-256: 0e50ba17eed16113dbb7d84be543a9f2ae4259718cb3ff3ef4a37a26b672769e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or hosting other malicious files, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution intent. The primary attack pattern involves luring users to external sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/9ac1dc798f01fcd177bc3333322e332c/68443323049.pdf In PDF document text
    • http://abwninemile.com/uploads/files/5528816835.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/25548852830.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/jurebesatox.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/89643446842.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/ruzowuferubelikibebuvoxod.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/bejuze.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/lawoxuxi.pdfIn PDF document text
    • http://robbes.nl/media/files/13901636212.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614260e9cb697---22352287638.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/jutajebupe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/8896322357.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/vawol.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/48909606973.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b77f89483---nejip.pdfIn PDF document text
    • http://jawarakreasi.com/file/43823899871.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/fejapazumoguzireda.pdfIn PDF document text
    • http://iphonerepairservice.nl/app/webroot/files/userfiles/files/57310927640.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/gefupolapov.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/mumeso.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/zejuneralozodowujibud.pdfIn PDF document text
    • https://camphacement.vn/upload/files/vawejifiralolokeki.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/vinugufawoba.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/wovijameti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ultimate+naruto+senki+mod+apkPDF 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 19404 bytes
SHA-256: f5e3be39c5ed57a32a267b6c9e2e386990be9912bc59423eabb5f81bd25e6cdd
font_01_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 10752 bytes
SHA-256: a22a076971dc7d20e5fdfd8dd1b133b82009449a6fab038ce5409046bafd7e56