Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc9f17828be4387…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 12:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9977b271cd10dd3164b49f81e1530dc5 SHA-1: 02abccc00f5a924d832fa86657a525f531704b97 SHA-256: ebc9f17828be4387e496c3a103b998290ff71a2ba9a02e091d22634cee3adfed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules specifically identify link farms on potentially malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://matsonconstruction.net/userfiles/file/mewumemav.pdf In PDF document text
    • http://ncdesign.it/userfiles/files/bugokowutopumataduvu.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/19822463502.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/60862436107.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamuga.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/74195785472.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4fa6d079e91dca4777a2a85fab4ffa8c/kutasavizapezija.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902111636_mnuzkd.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614aea73547b5---momefixiwetim.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/61312525882.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210922155529233825022.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/loguzoboravimodokifowaja.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a28be4b600---pelezowufajiteboge.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161378df6e3a3d---50233046159.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/refitawirafobe.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/guvidisakewibekoret.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/81728657050.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/juwetumigiwejudi.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/wuxixafafexelogu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vomisawumozitekivipulo.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/letevedenuwaxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=max+remote+apk+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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 17968 bytes
SHA-256: 319946a41ed7bed02e066d2c691dd9fac6df89773c04b50fea3f66a91d871f9c
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10568 bytes
SHA-256: cc0a163de7cd94e0ebcea62cc48b4bd2d92dc3184fe87bd48b49c31669d765c6
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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