Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4afa315d756f46…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 12:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bbb932bfd2778bc13a4025d09319e40 SHA-1: 7abed3628dda9673c1f27cbc6b74689414c5b6bd SHA-256: 4b4afa315d756f4683a70473684040c0f4d07abb98bdc3b76ad5f29aa80ed521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the ML classifier output strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143847c278bd---86178242753.pdf In PDF document text
    • http://torremaggiore.sitmap.it/files/files/sezilisowupukateju.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/47783208038.pdfIn PDF document text
    • https://activepymes.com/pub/file/dolotiwe.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/64050154986.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/deteletetekotefibeguf.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/vokikoladopotidox.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/68975518857.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/81563719734.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lufapewemugawibakiselatuw.pdfIn PDF document text
    • http://santehnika34.ru/images/file/63735183947.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e339c3f0f---41295819924.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/faziwir.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lowiselabatu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/75722796928.pdfIn PDF document text
    • http://woykoff.hu/upload/file/gefuvuwagodolawega.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lawowexebakonuxome.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd633a197889768d6a4618d2e3ef9cdd/leguto.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/47656735246.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/31138324488.pdfIn PDF document text
    • http://besteva.com/upload/files/39110827644.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/26209409170.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/jumufavodudeseze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=playstation+gift+card+codes+generatorPDF 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_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 10764 bytes
SHA-256: e473dad6dc5fc1df539f62665a159fa8c8ab65770b1c29de492dbe228e9d737b
font_01_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 17928 bytes
SHA-256: 6e6060dd13e75284c3f7dce97ad2626014542bd4a77298bdefdd499065c48e6a
font_02_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1