Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6a03ec281ec495…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 14:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 073eaf215bd6a2440811c1a9b2dda8ad SHA-1: 50d2ad1620ef45794a1a76ed0f366202ea707f96 SHA-256: ec6a03ec281ec495f1a3722e48af83a49d1d38c9d2e9d4d383a6d0a362da7b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ubk-sad.de/azubi/userfiles/files/korewopimogaxudanozasuvo.pdf In PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/759f87815702b982764df334278fb923/1768771966.pdfIn PDF document text
    • http://teraval.cz/res/file/zasin.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f67ffe17a618bc5415c61e0ad566608f/39375478479.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/xamoretaxew.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/63210346749.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/5548773185.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3d7593b54d4dd0ce976c1f459cf2a9a3/tuzagikexufokatinebazuna.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/12879d1ed89a0769997e007ec16c0368/rujas.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/22f58799806bc8940edb3cdbe355c415/gowilinajejubevep.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/23151000655.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65ccf402f---78478299574.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/af5ae763d3de5f4d5fd7d283eb23bb38/99304507205.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/bikipoxixevejomigof.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/bemodud.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b1e3a162---norasurerojilotafimi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/cd4e52ec786effc0063de13cf2be2629/57446802145.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/88306651083.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a317d40b772---paliduwoxo.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/zaduvimen.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/31779249994.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0b7f6bd5bbc1d450886de6a6cf2d224e/15558417780.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080501a5a767---75874535055.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/293aaf07f8e60cfdebcd27b153506233/wimunevutux.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/41386424853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=2010+odyssey+two+pdf+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_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 10696 bytes
SHA-256: e6994a14c8ee6f28344bece89ba0b8b484f8ffb8bace651e0248fa5caaf53abf
font_01_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 17628 bytes
SHA-256: 72a403736370b51f05060a9add60224b0b3fd8bdae4934fa9a946f02e02916aa
font_02_sfnt_off00014827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1