Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1a3358f8497ca0…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 11:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01c3b5a5fa9a5081bcb3ae07e95ce9c7 SHA-1: 9f4feb72bea00a6665445c56d39d2ca474413b27 SHA-256: ed1a3358f8497ca05910e717330834276672bcef8c13a327c9fdbc578965454a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is used to drive traffic to potentially malicious sites, possibly for phishing or malware delivery.

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://philabc.ru/uplcv?utm_term=farmacia+remington+pdf PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f555bb4cc2---runum.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/24547126486.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/39596611571.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/galuv.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3622a286---75422685448.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/76276358327.pdfIn PDF document text
    • http://ipllaser.in/uploads/14011381098.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/waxaxevi.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/werebepixovob.pdfIn PDF document text
    • https://viceda.com/userfiles/file/kixesuza.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/91742424007.pdfIn PDF document text
    • https://autoskola-scp.com/files/mifirubenoginumofimuwif.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/50824830114.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/dofuwafu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/196c14b2f59a299783058cdeda0372ba/48507650349.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/fisofopu.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/bifetevowukasap.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/9243315490.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/83502009584.pdfIn PDF document text
    • http://climtech.com/files/files/rosuto.pdfIn PDF document text
    • http://findusafranchise.com/files/files/pibulodadozekunuk.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d93b7f5ffcf341fc516d62aaeeba4f54/26487814967.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/funosojofozuxoximifi.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/zuruxoxufufiputodemevobo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/98806097466.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_off0000c28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28F 10728 bytes
SHA-256: 25b0c20040a806f1aa07d89e2639cd85489d2aa2c20128ce26fb3c7e71baa271
font_01_sfnt_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 18436 bytes
SHA-256: 50f549a6526952a985c918f724c7f4064b202ef01a9fa54c370329c4c050826e
font_02_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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