Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbd0d16a9cf4da8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 14:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa88dc2536c59f8df61c3c886e693845 SHA-1: cab1ef8ec1ec6f29208bd7d0755083a24a97b964 SHA-256: ffbd0d16a9cf4da82a46cde185aebb784d4d0495c2884134d9a409073c79d56b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious destination through a network of potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=imaginefx+free+download PDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/14e69c8c719b2c995e88bec019262cff/12325964045.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/22647278708.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/rinurosalonerukami.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109100601241767.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/92918713129.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/birugevofuwapoxo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574beec269---57797779241.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/movivimuwur.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/58784041198.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8163132998.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/saxabepivax.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/18332583467.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/jusibugedopinuxuduga.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc19a5226f---82877012245.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/14852423331.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/53330446108.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/49705112735.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/36162616220.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/8927588000.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c4187bf0---97787530576.pdfIn PDF document text
    • https://cargobull.cz/res/file/jozop.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea12aa9467---43764739467.pdfIn PDF document text
    • http://yanartextil.com/firma/files/kutexarepove.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/vitijun.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/kokebodevovefafeza.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/49831248959.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-14/images/files/posogejipigu.pdfIn PDF document text
    • 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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 10572 bytes
SHA-256: d37d48594db1b35922593e07a3bc919a656f27be68742fe95b40cee304a6c6f7
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 18156 bytes
SHA-256: c0d43ed20d6439e9afdabfc1c56d44c0b1a2fc6155e4fccab473d292fe5a673e
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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