Malicious PDF — malware analysis report

Static analysis result for SHA-256 be53e9bdc7165ccb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 12:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd8b979f797df18e6d67be8f9b709743 SHA-1: 463641d7b86eb50a545dbccd2d3b22ea1cf26100 SHA-256: be53e9bdc7165ccbb89ee20af8212f6557b5a892481ac40189a9d04a930f6c7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_DOWNLOAD_BUTTON heuristics further supports the attack pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rupoma.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d934d9d6---23442360425.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jononenewopogul.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/8499236239.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xigeliwu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c788fd47bc---totonerejevumubudekipupen.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/pezafulegodin.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/18991852280.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/xefudezonexa.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/69595227991.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/80284203109.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109061911205542.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/940433fe586b155c08cb8522c1fb1d5d/juboxefum.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/83106567418.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/84104652358.pdfIn PDF document text
    • https://cet.sk/res/file/62028388145.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/49099520472.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6f050b21---26700060844.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_035534.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/gelufewovuvulosafedilir.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/62853969244.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109080945416706.pdfIn PDF document text
    • http://www.bash.cl/media/file/6774696680.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a040286ca4---fekevapowizami.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/46430956671.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/561f7f925e4247c7016206389534c1ab/ruluxuwezazutetoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=watch+web+series+online+free+appPDF 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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 17592 bytes
SHA-256: 5a88f085dfa763bc6948cd021c7f92fcf3374ccd1193be5fbda9195f567ed334
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C90 10796 bytes
SHA-256: 7d3c4a20957f6437baaef9cbb1e8b8c51fb9c9abb3f83d2e733bd4850f962ef1

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