Malicious PDF — malware analysis report

Static analysis result for SHA-256 341bbbb711dcfcd4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 11:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53499108d92ea06597fa60dc7fc8e105 SHA-1: 30d2b0614341861679ec2f6e43f26691767b2ec9 SHA-256: 341bbbb711dcfcd47ea6c72af09841de0175c733b12005b215778fc384e97f36
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external sites via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2271e31778cba4248a64a1d40ec9a6e6/57555600334.pdf In PDF document text
    • http://rrarental.org/upload/file/56134245974.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/aa638a88265ab50c457bdff31fa344ab/xevotiludepugojak.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/xefovuxoruxikiposot.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xuxebem.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/mufunitabipe.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/33745859545.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/daxalowiba.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7280cc1ce8292843aebfcdb1374e5c25/gagudatilif.pdfIn PDF document text
    • https://premium-house.uz/images/file/25932913122.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd9553200---nomafiforopedawebuj.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/64693697681.pdfIn PDF document text
    • http://skisun.it/userfiles/files/gotes.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160943e1845ee9---kufuperi.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/zefafiji.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e592d53eee---vijonozusejaxekubev.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210620024753.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/83615895720.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/xevunajulojewuxaveliv.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c3969c3f---loperajo.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/39874569983.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/16824379513.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/8580597442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pinewood+derby+templates+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_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 11000 bytes
SHA-256: e958489e41ea93f4d1f5e393d444191637fdff27f16de8192cebf3248853213b
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 18580 bytes
SHA-256: a87421cc860d8b1533762e41abcfc260fe81557545586cd43fa8be59aeca82af
font_02_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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