Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bde3bdd20405ce…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 16:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20e85a6b20683ec5c0344b4bd0000667 SHA-1: 14f7434759e7fcc3af261cd7eb03ec21da95622a SHA-256: 41bde3bdd20405ce8f0a80c41c5d1337bd28f08d0493d3a9d7d97c475f53e8b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sanraimundo.cl/dyn/uploads/file/90714487200.pdf In PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/daxuvumebane.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/42337169038.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/953711388.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/54806256074.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/simiwavurimovimibodu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/755a34d25d3b227fceb1432e9b15079a/katozoziridemorumoxinebop.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/popewipoxitodavomuz.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/44347396262.pdfIn PDF document text
    • http://kahasat.cz/data/file/xenataroguzuza.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/97311630735.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/fivusofixox.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/tixedatidasil.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/49174967260.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70464883984.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/xefabobikoxikiji.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lerimuturopobebo.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/69157422914.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/12050250713.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda31beac8---14324263193.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/84456572636.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/12506939589.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/rosogox.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/23288346709.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c59hesop2etjuft61khhdfaeh1/tuditatavozor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=miui+12+dark+theme+downloadPDF 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_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 17600 bytes
SHA-256: 9cce05928eb5ad45d2e8c71cdf790855353ffce49f640c29ec921d38870c54ce
font_02_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 10788 bytes
SHA-256: ee284672eebca5c5027289fc3fdb90d9cab8428045176418ef2e59b8a50def94