Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31eda5bcc72bf2e…

MALICIOUS

PDF

100.5 KB Created: 2021-08-23 10:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5192984e167a5521c30c82936a1f3b52 SHA-1: 424405091d86b2c09445137b84708ff2377db4bb SHA-256: d31eda5bcc72bf2e2d98fc40b25749bea3678259c65ed7583a8b22a12b960186
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://draftingfloorplan.com/ckfinder/userfiles/files/poverik.pdf In PDF document text
    • http://tataservice.it/userfiles/file/julatojuxebekibuva.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/saripuxuvanadazu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cccfee9abcc1fab8be00d97d24d4c67a/20579208949.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3baff099fc69d2971cc4cf2636b916a3/vosopemeverusukenatalomo.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/dunugiribinuran.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbb7a8610---wanojawufupanavajopus.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f9fadd43647da59b76204b952c673564/23027664295.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a867f586c86---50217754115.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/defedilex.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/61089008435.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5a46bdb1c6eab592de21a30f4efd9eac/68253463660.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/88031971738.pdfIn PDF document text
    • https://moolans.com/uploads/files/zikewigibamexevoxinif.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wemevoditabizesufiwubewod.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/patuxonodukopoxodepipa.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/toredipemaviriluta.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adee5f2750b---bagamagufulokikosami.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7d6a8be99---xatofosisizusamekuxej.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076462eeb2cf---jevavuxexurikuforebezeku.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40ea78237---balizebagikofexenafipi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160984bdc9ad39---benina.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882cf9458d8---42296070463.pdfIn PDF document text
    • http://i-physiology.ru/upload/11382727176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=democracy+if+you+can+keep+itPDF 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_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 17460 bytes
SHA-256: e9f1b7687f2db492a269fcb01f5ed1ac12161283140c55f34fd23c0c3a98f701
font_01_sfnt_off0001529d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB4 10732 bytes
SHA-256: 33c8962938dfbfdfcf836d98a5bc38ae2c28d550f63d7ded9a19740b7d4248f5