Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b744f916e35ac4…

MALICIOUS

PDF

93.1 KB Created: 2021-08-12 20:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 05a7f663855dd3714e5807363181ca2f SHA-1: a08ce3b9be83d383056965310fb5172299650612 SHA-256: 98b744f916e35ac400561d956224961c6065a00a20261fa2eb29085383eaa3fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5ce9c48f59caf21923ca0c2ccbf59525/bulofoxasazetojov.pdf In PDF document text
    • https://mehreganimaging.com/images/upload/files/43334439629.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54bfa72c0f---77239121689.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/kakede.pdfIn PDF document text
    • http://artospace.com/pics/file/76355399644.pdfIn PDF document text
    • http://rld-carbon.ru/file/96064576653.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a30ef26dc31e6de98fe56b8f94019c8c/wapilizofakulisafeti.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/89152928889.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/582e3c884cf11b9d0784f9241a882952/zonazanomefelusomuval.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/436a5c8e38211ba68515ed0faa6c7360/45735588704.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/senonifebunutola.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/xupodun.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a431988506f1571008f78b17c41bb46d/rutaboxigel.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa658b75b---13804950045.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/tezikufidofuradidu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160799f604df33---dubominu.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/kifunepon.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/1991559090.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/eefb8ec4a69a63a04d97aa1c76ecf501/87561275399.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/fisunozalekofozo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf2cbab07---podevelafogesaxadu.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/50427310159.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d0061a0e106b5189b4cebdcef31e52aa/gojinaxakopubetu.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/46127112787.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/kalumu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a3ca6fde3f4609aea3598d309c4a8d42/debobakowazolavejos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cuanto+son+250+gramos+de+azucar+en+tazasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 18808 bytes
SHA-256: c8c80a65f3e6486a9cc766063bdd36449bf2b78ee2085c61e73f22edf438d55d
font_02_sfnt_off0001345d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 11140 bytes
SHA-256: ac1e88f915cf1b289c48a8df6e4cb53ea012ff831f3a73749d45abaaee187885
font_03_sfnt_off00014e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E62 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58