Malicious PDF — malware analysis report

Static analysis result for SHA-256 338d966329977775…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 13:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b6fdf3398d48f916a6be7658bfd8550 SHA-1: d64c4d174f51e5fd0c3ea6f7177ada6ba8d55135 SHA-256: 338d966329977775ba00906f48a5fcef93b9bce95719130192596c59778f25d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a56a77096a8cd4851810f3476f9e540/nuxorilozemanubugomemod.pdf
    • http://hankyunget.net/userData/board/file/bimosudazogekixevulo.pdf
    • http://massimobertoarchitetto.com/userfiles/files/rimana.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/vojoxumiter.pdf
    • http://fratellilongoni.com/userfiles/files/17580639051.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/11454080663.pdf
    • http://concilianavarra.com/userfiles/files/94282640588.pdf
    • http://hanabi-la.com/uploads/files/20321776064.pdf
    • https://chungangroup.com/uploads/files/202109050756338216.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d028312323---votofupevifazusefib.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/47915104111.pdf
    • https://lhorizon.ca/uploadHorizon/file/givagixum.pdf
    • https://betenagro.com/sites/default/files/file/11465889674.pdf
    • http://szjg.hu/images/file/72859653425.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/38763509019.pdf
    • http://hasicimosnov.cz/foto/Image/file/20308411504.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19d197806---rufekabugisexujivazik.pdf
    • http://dotykbylinky.sk/_subory/subory/96197347597.pdf
    • http://www.vegagastro.pl/upload/file/mekamebubifono.pdf
    • http://saikunghouse.hk/userfiles/kobigofuliwogogotebeti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=one+piece+anime+site
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc98.bin
7c73b1d46333922546e4795794301ca51a87e4fdce2baa2c0d76b54a9df03e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 10296 bytes
font_01_sfnt_off0000f3d3.bin
109b778b5850c97e7da3f8b9e29daddb92908486366f80f2eb591762ba9dd7c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 18396 bytes
font_02_sfnt_off000123cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 16792 bytes

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