Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45e7a50318fdf41…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 07:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25f12ef32e81eeaeba596588797c2bac SHA-1: 77f45c03f85e113b26a5d2dbdf3d06357575d153 SHA-256: c45e7a50318fdf415cf7e6039a306d19e520bcc04fecf518382e16c6ec92bbfd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, 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 malicious destination. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9356

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://coretry.ru/uplcv?utm_term=gyroscopes+system+s107+metal+series+manual PDF link annotation
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p728kqo9gkq0umitk18q9kinei/gevidokugotejefu.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202108291303499061.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc25619f30---61742221064.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/13349945266.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b084171d---nutazuroxi.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/wotov.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/7289470123.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/67709457190.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0ea08552---24573691268.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/nokasil.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/xekekowojifi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vakipozarowikew.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f111e7c9---22791845439.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/gojure.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/13638277668.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/65800684369.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/65216782275.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/vevosobakevisotobudiga.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/petame.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/uureqepjkqfq41jhac56h8402t/87461429406.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/kujezepekopibegozig.pdfIn 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_off0000c198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC198 16824 bytes
SHA-256: 7432cecd6d6d37d0af6e2dde4c73bd1d457daabf42ee9ab03ef968e3149ea509
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 11012 bytes
SHA-256: 5eb80f47fa0a8aad23ee9a5ea20d279b475269f3fb72fd2630db7733bbfcc5c5
font_02_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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