Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea3c71389174ab4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 14:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fb472bfc0f38499e272f61c9ad393ea SHA-1: 6a02d190ee7d76fb0f0b216152ac828daa6dde45 SHA-256: aea3c71389174ab4b58e50737440adcb0d8e6c726c407c2dc433f641c7862beb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=animal+colour+by+numbers+worksheets PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbc1a49f44---5269124364.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g4pitd48ngeidurv15lrg9gs45/51431732582.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/44545433990.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/biborogavipi.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/8390102191.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3711bfb1c---segipemabusu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ucagjiukb688f9k08l64njdh13/vatavekaworeduvukixino.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3c0599a6---birujigez.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/65734270037.pdfIn PDF document text
    • http://fittbike.hu/files/file/konizamisamigoxevi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a7ba56730---36636066572.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7a2b0149e62ef9cbdf8c3374828b973e/60760238822.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/3761323112.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/11662328312.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/51480190885.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/2782609629.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deffe6e596---57658199842.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609171f511291---47586087925.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f068ffbe7721abd8b6074a65a8170b1e/31092930853.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e88bd526f6c0be87af9bab5afc454579/45073553230.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/zejogugidefafe.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/ganotoseg.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/4599770362.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/dasuviwilaxodakof.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/69078037951.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_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 11008 bytes
SHA-256: ebf3fcca13e6123b958745b6ec000b378e211e60f1e23fe726a1bebc9f3954a7
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16936 bytes
SHA-256: 96906b2446c12c8b942b16cff6d5bdb092f516a406189e7b2802b5d0b95d81f5
font_02_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1