Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12de90da22d36ba…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 11:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8053122f31a71bd284ae1d5e8b2e8ee SHA-1: 056df0ef974857d425518c319117bb73a54c2c8c SHA-256: b12de90da22d36ba581f2907ed75eae68eeaeb5fe6dbd50afac978b79aacb733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0524f6c54228bfdfa063d67b3fc22f6d/21867662313.pdf In PDF document text
    • https://karolinanowak.com/userfiles/file/jorelofifaguj.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/gaxojugavaf.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/25069248985.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/90fe538453d3a00dbb260a51b7beeaf9/68299970559.pdfIn PDF document text
    • http://travellerisland.com/files/pobakowurawenuva.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/16136530745.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/47728751709.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/gupelasonivewof.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da44e022f0f---93738142015.pdfIn PDF document text
    • http://samtekelektrik.com/files/wexoxivumuwa.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/68601349478.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e19a823d---6786024412.pdfIn PDF document text
    • http://amdind.com/userfiles/file/83782885290.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/7244931446.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/790627287.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/zuzoxolotodewekaxosojamu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805b45ae495---75581739303.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb891585b6---39236157642.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/16190917697.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/49886121891.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14799184069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=operations+management+stevenson+11th+edition+solutions+manual+pdfPDF 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_off0000bfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBB 17556 bytes
SHA-256: b7b88ea869af85c678bff3ad20257e4463ab092829196935d4822292568c14c5
font_01_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 11188 bytes
SHA-256: 19dbf5097ccc3b0215455eb1a065cf78c74c865793a6b7652bb7fbceb5fdb4e3
font_02_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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