Malicious PDF — malware analysis report

Static analysis result for SHA-256 c910151cebd832d8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 01:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5aae7a4facf1120492cd856bb9c989c8 SHA-1: 422f1ebbace813debe1cb4dfbd48ef6f1c86c1a4 SHA-256: c910151cebd832d88c8680e7790efa7782d130f04bc719ca6e807fb6a0c45c8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fiscalonline.ro/app/webroot/files/userfiles/files/kipotaw.pdf In PDF document text
    • http://akademibt.com/resimler/files/10057749458.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/xajepamamorelufuxerosum.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/57717707182.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/namesegu.pdfIn PDF document text
    • http://live-net.it/file/59382208708.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/18809032351.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/limejo.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/31818378819.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/wutupaduvaketuse.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431d4f6d3d0---74863497483.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/kinegaze.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/49700703272.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/xupadewezefugugu.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/rabarevigusapemekijoxure.pdfIn PDF document text
    • http://exim5.hu/_user/file/79172806717.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/91301922885.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161363ae1aa12b---vozij.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/21825210112.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0a2c8749---nagokol.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/74295847993.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/dutuvivesejuzeko.pdfIn PDF document text
    • https://biodez.lt/i/File/26034213689.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/94722570015.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nusdvc8hr6t195nep857qepok2/lamugofetipav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ullu+web+series+full+movies+onlinePDF 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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 17272 bytes
SHA-256: 417da1882d1e3861ed710edf0fb0f9a285b975331965c62f09209767212046c8
font_02_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 10516 bytes
SHA-256: bfe7a7d20514ced75a690710d344c550a75aa8b0b67cefe5666a84b662b59e49