Malicious PDF — malware analysis report

Static analysis result for SHA-256 436861d497d7aea7…

MALICIOUS

PDF

88.0 KB Created: 2021-07-29 09:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a744edf20b9c54afb3cfbec4a0e2600e SHA-1: 4e1eecdef619944b8d0d60820c2fb82903ed2c22 SHA-256: 436861d497d7aea7d40cae3b2fe4c64193c701776c8970efdc3882f33959df9b
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 phishing or trojan payload. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 7

  • 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.
  • 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 http://asvpp.fr/pdf/gevowagusuzofinu.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe9cb6746---sofuxewituwivegubunazov.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8ab5ded1dcd063abc54d1be4df1c7239/24274060570.pdf
    • https://afmiletisim.com/resimler/files/57142432119.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/90b9dd4abd87dc52fd214f7f9a8afdc6/34650195832.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/geruga.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c26f74ec56---sadafatumovukuwalumu.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/08202624c38ea239c4ce340ca381ba39/72265779996.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/294b2abac698769f13e3b76019e94487/fanazusiwakemijo.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bf9c01ed---dutakedikijidurez.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/lavevidepewuz.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8g2j4pd9h23op35m3cpfuog3gv/tiwuxuxinasekiwokafoge.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843529e7d3a---bapijilizonojerefutebikax.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rmbfsfo2cl8f2qi95tq24ssnf2/40307088670.pdf
    • http://lnaixi.com/userfiles/file/20210725154906_838188202.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e54459505d---36149213906.pdf
    • http://apsara.ru/userfiles/file/biwivito.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21062108321538401466mmi7.pdf
    • http://chiengthai.com/file_media/file_image/file/28666917937.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3e09c26ce---tidar.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/84b75227213988814fd9c71cfe384f8b/65371689188.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84367a615---77703367797.pdf
    • https://stvorki.ru/files/file/tajadaxatepefimiful.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/epru9qk3e1ike67l17aelrt287/76780457986.pdf
    • http://konemara.hu/userfiles/file/zubavaxenaloxatemitijeluf.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92b480abe---vopupoxozazes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+lean+manufacturing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f621.bin
4a2eeafe67e9ac74465cfcf0a1356b53c143208876cb176a6dc70493ccc79adc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 16440 bytes
font_01_sfnt_off00012092.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 16792 bytes
font_02_sfnt_off000138a9.bin
26eecd5c46b75cc6d4b3d3bda80997aaa16192d16223f3585506e00fec90ef42
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A9 10688 bytes