Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffeca509791c0c11…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 12:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ab0d6d876b6a360fd3242b8b25f0902 SHA-1: 56f9b644b03824fa02ce6b40cf6168bcbd2c0f57 SHA-256: ffeca509791c0c11d5a32b70fb91e9bd99ffe9f433903c7b8d9cfa4dd60558df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating redirects within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://pomodorolennep.de/gfx/userfiles/files/fapaguvudapikatupabem.pdf In PDF document text
    • http://vit-physio.de/file/16020393967.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/20903946674.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/zegoderozagoponukosefoxal.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/5461870870.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16141719c575d9---degobeb.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/fexijomasinow.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/56921831332.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/95707694426.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/suxizovoluxigegixu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403c7746da3---roverinemulozilepevuxanip.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/52798435750.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/leviwanidasukibofi.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/papevipo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244b520a8e---92778037665.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/tuvorafemunor.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/50208376303.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/56053821031.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210916_FC569D6A49C4050B.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/kogus.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/suwulogopudazum.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/voridewolugesobepuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pubg+lite+update+2020+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_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 10868 bytes
SHA-256: c7d227f6469198a44115115cfd124147369adeabdffbf8336ec37eb2bd7f5110
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 16824 bytes
SHA-256: 9ff1dc76e9a9e6d392e0aebf545366351bd85513b2a22526035731005d75e9e9
font_02_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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