Malicious PDF — malware analysis report

Static analysis result for SHA-256 590cc1df22f67c1a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 23:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eac544f73818ff976aefadc765ce463a SHA-1: 5fe91e806e4b8225859108793f0b7f4ec195a8a4 SHA-256: 590cc1df22f67c1aebf7dbda4eca7cd36669fef5a289617ddde40971e90983cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=the+iliad+gareth+hinds+pdf PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400eb047948---podenamoguk.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/gaval.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/ponot.pdfIn PDF document text
    • http://bankerz.in/qpic/files/robizakatoretekutifiluv.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109081313084847.pdfIn PDF document text
    • http://generaldistco.com/images/file/17428110838.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/riwubefinujewilesisez.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfcd9fffe---zuneroj.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/94200148038.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/ruziri.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/mulevuraxevusogi.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/badaganalefu.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/78457352511.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/favumo.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/bomolizurud.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/lezowig.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912123355.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/lonaxadimawumelowab.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b549690e---67465076735.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/lujizavapos.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/63545814296.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/40984004654.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/91583152569.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/demekifafejaxazupavaka.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/kevowonixefatoviwumaso.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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 18140 bytes
SHA-256: c15fb1d331eb818829cccc17bc6b7321b1f7eae7925200d1ee0ea2d59751cefa
font_01_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 10620 bytes
SHA-256: 7002ee8f99dd06d2a7a90d150c8c63800a7e182f29e8d288ec0fc0d5f063f7fc
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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