Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead67c5226b2d507…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 16:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 178f8cdec8d043eeaa9c2ccca535fe2c SHA-1: f44d2fafd3d10cc1449de2a373c46fec36efca22 SHA-256: ead67c5226b2d50782d847da8e34774e96957ff358e50b22c647abddb05a9715
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The numerous external links, including those hosted on compromised CMS upload storage and disposable hosting, suggest a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites or the execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=newest+movie+hd+apk PDF link annotation
    • http://eschool365.in/js/admin/uploadfiles/file/60323967226.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4de8a75c---15322251205.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/levubinaz.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38d962338---tuxuv.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/pigav.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sakidodinagosuvati.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210910183804717570.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/85865586140.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/44302058971.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3dac717b---murewazeleku.pdfIn PDF document text
    • http://quetthe.com/upload/files/44364493870.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/30224689607.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/3402947025.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/jodojalisifubofovivawa.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/bugemiwabefa.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/kaninepofaso.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259244db4---92121946672.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/968333f7d9e976fed08fcc65950eb34a/55902410510.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/546403935.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/webumopisotezos.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/71430977916.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/xitugobikoziba.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/jonebigitagupalap.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/42408308892.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/sirulumim.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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 10628 bytes
SHA-256: cea76463abd4206559a6d3a31f021337b47fecc9f0ad5abbbc452b1a3f9c0713
font_02_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 17912 bytes
SHA-256: fc2bfb1a725472881c12fa8d318b3de1907b06277e10e1643dd10d96c74eb15d