Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26dee91745bb8a1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 16:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31c7a03780094054dd571a9e23b6bff7 SHA-1: bd25e66e309f18825b727a8e3078ff84c4c7ab1d SHA-256: e26dee91745bb8a17d0ffcbbdaf21f0f48259beab277da273f4f8d488467d49e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple links on potentially compromised CMS upload directories reinforces the suspicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2a734504---divagi.pdf In PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nuziwad.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/rolowadekubimiresu.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///13837454412.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tnoaa3qvi7catsvij245r2kg8d/sunufenuwuvavofizuxogotof.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160eda91958204---lujirudisazu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebef4db4e2---buxinataninivibenelito.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/20208985237.pdfIn PDF document text
    • https://coatielectronica.com/files/nulovurubawatuworinik.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/telamogarudirep.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/33398707736.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbaab1eaf0---32207228448.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/vapugapip.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/64714834920.pdfIn PDF document text
    • https://pindimana.in/uploads/file/10581963233.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/59948513298.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610d6a989e730---kevafipegajaburedok.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/67509198179.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/jiluw.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/kazunakorofazu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fcef916aa81---rovemapeboniwofi.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/95459870105.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/murilomujiluvofuvi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/278ca52c5279fbe2d5f94e6c11a338ca/39934020341.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/9cou663g165o8ujn7cirl2raf6/kasopibeledusavasokowopon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=uniform+civil+code+article+pdfPDF 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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10684 bytes
SHA-256: 4623af473c867e041f2607984dd6b7fab3f5deb9c770900052d903f36ecf9428
font_01_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 18948 bytes
SHA-256: 7ada464c7678a2a064ae4a680634ea44784c9ba5f4f995239b7bd24c945f3245
font_02_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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