Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dbb4197ecef182…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 17:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd23bb84047fc7da1bfbfc9d78077adf SHA-1: 3cf5bb79ef35537f038ac4286e253ab0ff37da23 SHA-256: 16dbb4197ecef1821fa12e766f02e3df28e3fed07f4bb183267d51293e191096
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to manipulate search results or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816afdb095c---kaxubovidikokeko.pdf In PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2cba51b1bb24f4ff5cdf8d0ece6bb9a3/tasagajusu.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/gudefufuxamebebi.pdfIn PDF document text
    • https://ptogel2.com/contents//files/14661597778.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93828571842.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0fbb1dc1---pawamum.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfe4aeee9---giropivetosakar.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/19970094898.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a348ccdec79---zesufatutojetamesedaza.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/pupizareramotiwaruvudu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160937e175d384---ragusesezibezis.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/86e610022c3467ba8daec00140ff7bc2/wetedivuli.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613295cfe14d3---70685165775.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4c09905b0l1gsrs34p786vfuii/fomosidafoler.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/35864246739.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/fetoxorupazu.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/rewegasurob.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/popojaxu.pdfIn PDF document text
    • http://stromzeleny.cz/file/2273462252.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/giripajeru.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/fekow.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rggdke8f04nf6ou3kav0nsg8kr/14392669178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fundamentals+of+economics+notes+pdfPDF 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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 16924 bytes
SHA-256: 2dbfd4f7498017bfd1cdd1185aed458beeba7a324f2c29f610c8464d845b4705
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 10756 bytes
SHA-256: e79ca71d513e30ff188081c22f90effdc9e89a26bec551453b8137951290c295

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