Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbbfffd2a8b5768…

MALICIOUS

PDF

54.6 KB Created: 2021-09-12 19:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 851cab04174017a32146c6c51cc7529d SHA-1: e830889e92957bec0389f34983899067d1c71aeb SHA-256: ddbbfffd2a8b576847952e7fbf059d11127c4bceb80fc92265e25702b2210013
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7921

Heuristics 5

  • 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
  • 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://bidmitt.com/img/files/file/nuzekureziwipigez.pdf In PDF document text
    • http://chinawin-consult.com/userfiles/34922289659.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/41082643430.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4012d8bcb---xegagodas.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109111528454063.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vipavata.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fewuxuxotokomi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd691f0fd---21624002126.pdfIn PDF document text
    • https://rintrans.com/files/nariporem.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/96659295062.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/71405352836.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/61358085042.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0e1afa0a---pujalazu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/31091717192.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/pebilevoluzifapapiv.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136137f30254---rinokifopu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c281c0c6---18532709975.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/60676990863.pdfIn PDF document text
    • http://gro-felix.si/uploads/43239504800.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109121517357118.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/80637166045.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/72420554111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=english+grammar+book+for+class+3+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.