Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1f3b38c990cfe2…

MALICIOUS

PDF

74.8 KB Created: 2021-06-25 19:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3a18891c4aa9becb9df29646efac49d SHA-1: 35adc4c650f3727f43978f5124d86c8f10019864 SHA-256: ad1f3b38c990cfe21dc3d4e94e9804b1b0a64a896523e6d29a144b25814f3939
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5356

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=plaintiff+meaning+in+tamil PDF link annotation
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d83ddcd4---wamizilo.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9bag9qi4iprf4g23dj1usnmk0h/65421189643.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c531d373497---24066727658.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///77015169264.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/74004569627.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf95a7b5459---91888178099.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63340160985.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/hnavu545u32nf0ca0gqdokdb5t/23846873731.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tcsikgm2fthllmfk1824jll5qg/xiriwekud.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/gotepi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/50440070685.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b9eaf07f---vugulemomavugak.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd58666e8---96561459984.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e9f649c5cf9244c6f0252f754dd4c518/pekosepemu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3803016b---15342905837.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607596ae9d027---leloretaladumugu.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/fiwipomeradum.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xatamumewuw.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/3491340894f322edf5c96a7758f0d8eb/21914191525.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/29297756483.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/20195379514.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a370f4ad62f788bdd3861de2bd339414/fulidusikulonuduw.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/jetimedelika.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/23092784927.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/pakifewaliwewufelexupodop.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/400052e11186618d223320ee3066d5a1/furenunalaladotaramowos.pdfIn 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_off0000c435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 16856 bytes
SHA-256: 992a9d9b8aca145a7ef56204af3c61bb3b094f14a2ac06e5cd880f532f6c47ef
font_02_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 10172 bytes
SHA-256: bfc1e8be45f6b0a579afe7dda3b92d2595f627d375ebab3b7aa0342e892273cb

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