Malicious PDF — malware analysis report

Static analysis result for SHA-256 83145b3555db7c43…

MALICIOUS

PDF

115.3 KB Created: 2021-08-31 20:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd1edba27db209c9a2e0311d5705301b SHA-1: 9bbe5331e55976d2233bd8137bffebe8358c7e68 SHA-256: 83145b3555db7c43e2e927086814c862fa8c66a58892f69a85e401c98855c0cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9aaee865---6895570987.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081646885860---donurelexikelad.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4ada65457e6d6fa2dc596a6c03648b91/43201536966.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/26781991279.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c17dfbcb---89947435292.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/51499330375.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f6d0a795023701ee99ccb9a0665fa95f/dumomulufunilal.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/gogarexufufutubuku.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210801_D56911598DA4DBF9.pdfIn PDF document text
    • http://ned.ru/uploads/files/26452096765.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/dudeselopabegegepelopot.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e4d8c6034b8e3fadbcfb15169af49be5/fevub.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210829_755EFC0A1B0D5574.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef56eee0af---waguromipilasimipu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0507ef68abe6b54eb82cec63cb801df1/jerididadedipumegokoxima.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lozuxakotinuwukiwobemi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/4272072132.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/844127914.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/21611138204.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711bcf03827---39974656075.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/66158894675.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082367b3fc5b---bubiwedamomaga.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/dotuzanimufebegonetetu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c1035662---kalisipe.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb429ad596---keralobobovaxolurajozedoj.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/fojubuxuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=thomas+sowell+websitePDF 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_off00015f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F84 18824 bytes
SHA-256: e729e69b31ad610ff300e7c51c677ac8a26da6f3482151520633033a1a70cacb
font_01_sfnt_off0001902b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1902B 10360 bytes
SHA-256: 4057604ceb62b37573d53d604dc2236e70937bbad2d10cf495802f785d57253f
font_02_sfnt_off0001a7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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