Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eeff9a5cbf1115e…

MALICIOUS

PDF

87.7 KB Created: 2021-08-15 13:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f3423416e31ac38bf9b493828a36687c SHA-1: 89b861f7939fb79f5e885d06fbcae7645179aeae SHA-256: 0eeff9a5cbf1115eaf220e4ba9987a7ba6d157c8a3fe5439864adbca0ae52f8b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to external, potentially malicious content, rather than containing an active exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c67ffba23bac677d34987fd3cfa526dc/nomolumojomosowawevor.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/djj8t2ehgi62qri865egjg54lu/batub.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xolazovinelawudireves.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/76606084779.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/wabaf.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/jivefujonudoxafo.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9eb9302b---jofodiruwilikim.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/69549773648.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/senufaferuwilorejimo.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/denukitiwefezuvuvusiroz.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a954b1592ca---34810383027.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3a43ce62---funemejituv.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/81019761081.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/xajumiwikijedojafogujemi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/d3emnc72fh193vc1qsne78hrpu/xuzezo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/rolalizinidimefulo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bcf768a4---pakinoxegun.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cf4db322a8ecfe4cda1cd53c68da9cfb/40264054287.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/75055605787.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/41742081376.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ce76fab8---47504814632.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8a1eeac9605473f30a71c47b01735eaa/pabenexiwaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=antonopoulos+mastering+bitcoin+unlocking+digital+cryptocurrenciesPDF 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_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 17388 bytes
SHA-256: b0173bc82a5ce9f081c03c9e3a11b87629dde2c8d03b5cd7c91705427c83aded
font_02_sfnt_off00013673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13673 11284 bytes
SHA-256: bdceebc9c1c40de1b0e8aa80b1dbae472d2660f5c8f483353f5769dd4beacf5c

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