Malicious PDF — malware analysis report

Static analysis result for SHA-256 09906d49a64a265d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 05:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d0529b55304c19d2c1822a58fc8a239 SHA-1: 8c97f42e2f22f8a714e05b430eb52c118b6fdd2c SHA-256: 09906d49a64a265d1e15af564cfdad3a2f574eae4428465e0ccbb386fd352ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely intent to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • 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=law+department+manual+pdf PDF link annotation
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072949301de0---xododute.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/29128921144.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-17/20210617173853715463.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de44a2173---lovoribululadizepozegar.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/78d9574385fe56c3f6e9321828740439/83324302689.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c8491272---firipojuxesa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626e0d5493---vexinukew.pdfIn PDF document text
    • http://anindecor.pl/files/file/86091780084.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a6a250cd---94609836587.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/zobupe.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/16344673365.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7df0227ff---kakajubuvesujogupa.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/31398652153.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/taradaridebutemi.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/vezelujuzifotubopalo.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/57995666146.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/23090478077.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611c5b05c5bac---pesurixilulovozimomaf.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/natobulavilozuxiliwaj.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/lexarafuwodini.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/tufuxukaxob.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc8435670---mimurokid.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/17484204951.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_off0000c60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 16124 bytes
SHA-256: a169a0e3a70d34bf6b95cfc123dfea2c89672b867afa1f6e52524f890297b3ce
font_02_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 10420 bytes
SHA-256: b3a933613ab45576d4387fef7f007077a9983c38652f255e6c3c6daad7147519

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