Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eaf06468983e54…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 02:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f1287b0a6373565fe5bf154c3f53ae77 SHA-1: f39d7e038e50e79298603f22fdfc286d42f50f32 SHA-256: 35eaf06468983e54b533522f709e79be3db047df3fe0738634a05199ae65f250
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms on potentially compromised infrastructure to host or redirect to malicious content. The embedded JavaScript likely facilitates the redirection or download process, contributing to the phishing and trojan detection by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.c-l-r-p.com/admin/ckfinder/userfiles/files/22125173784.pdf In PDF document text
    • http://vetusmeter.com/images/upload/File/tekometakejawotabobo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/89641e5c014639f203580bf9046e24ea/1398074212.pdfIn PDF document text
    • http://birdwatching.sk/media/file/xukaz.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/67791800365.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f460015e6c---nenew.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/mogituwu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/20067570122.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/83821807264.pdfIn PDF document text
    • https://samudra99.com/contents/files/gogojavopubijiberapumoje.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e342b9263---magalixepabubulukezafe.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/toratapojotare.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nezebanufimabufusa.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/34966867793.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/kixezi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386a44177d3---96832201976.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/31337913626.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/18170441057.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/liliwolela.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/v756rf98bfnckbotrbafmd8656/refitika.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/26120251963.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/xofarefuxuxaladedinafo.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/26934511464.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8c0de999---7347842781.pdfIn PDF document text
    • http://parilka.by/var/upload/file/80662429794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+one+rom+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_off0000b4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A2 14700 bytes
SHA-256: 279c0021be57c189414b8493f99af40301d68653daecb277747d2ca6512b3be5
font_01_sfnt_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 10208 bytes
SHA-256: 8128294ef9357fbe5f62260120c865835113bc7f85295c289bf52482fa4f92ad

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