Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b97f06bc9602bb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 15:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 149e94e9fe97b27e44fb098ff4b52cfc SHA-1: 96ce3ac1067794efd60908d2911638e27c80c390 SHA-256: 60b97f06bc9602bb852ee25f867676f8da1e39ff6dbf8b55375b57a602b207a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially compromised infrastructure. No scripts were extracted, but the overall structure strongly suggests a phishing or malware distribution attempt.

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 https://garglob.ru/uplcv?utm_term=abelson+sussman+pdf PDF link annotation
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/79434186776.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/45fd91f7d911a4d6dd1665210fc2af91/menufuzabefixizatofanet.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/pixawore.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16210280198603.pdfIn PDF document text
    • http://mqskin.com/luutru/files/fawedekiru.pdfIn PDF document text
    • http://beiks.info/public/file/pezonedorepuxiv.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/bajolumikukuvugi.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/28620936723.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f1liegc7hmilgsh97l9dcha2o/8022613513.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f5ae390b---10325196576.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/buxatiterijatapodi.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/kowepiva.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/58395f4cb23e231a43a391a329080a04/12673050275.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a388802fadb---53255468797.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/35774161682.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/33288178575.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/mabajalika.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608600b26a9d4---javez.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1fc84ac9e675556c4efc47f31a6623a7/banuwemozaxeb.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210822_054831.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/wesijiwavorexizu.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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 10588 bytes
SHA-256: 2cedbb49a2e812fb123369c346066ae4f8e5d90dcbece7e07cca9698041d8e85
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 17656 bytes
SHA-256: a20faba12b9592db7e3536a55ff11d2061be980813dded2efdee151c88a42ad9

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