Malicious PDF — malware analysis report

Static analysis result for SHA-256 889b91970f71e72e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 05:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc0ebb5d1a2bfe8d61c5f9930b477f5f SHA-1: eb2e41c21202def121192c5bb0652e1730cd310a SHA-256: 889b91970f71e72e79f169f767e07664d5509786895dd6bd4a0d627a0599d22a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware delivery. Multiple heuristics indicate this is a phishing and potentially malicious PDF, with ClamAV detecting it as a Pdf.Phishing.Trojan. The embedded URLs suggest a link farm hosted on compromised or disposable domains, likely serving as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=dr+david+jeremiah+sermon+for+today PDF link annotation
    • http://kleiberit.ru/files/file/36859887553.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/80900671387.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160de63ae50727---zagajozasajejebelan.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/33dqi9lv7lcq10eu25s409dvb1/49106829540.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/57674342055.pdfIn PDF document text
    • http://xprchemical.com/upload/files/70791541560.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88b77f062a---fimoforivonazoxoguwo.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/4h19mreddgv5qb59utrdfgal41/16228503630.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210728154717.pdfIn PDF document text
    • https://melz-feu.ru/upload/lejivoxedewume.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/gepovabilugapelozutunoji.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8tu84hfg6l71ed0alpmqcu4nd4/41622117821.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d352a058---rowuka.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b187eaf9d---suxuviza.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/vovofef.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98d9b4dd6---budebikube.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/91415374937.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/nomedukezi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3349827498386b239db30b4a1b15790d/sujop.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xipumomesukutowakir.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_off0000b80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80A 10884 bytes
SHA-256: 9340088788fd32c4a4bff5fd5f214491bf170b80404c616be1e97aeaa4ca7366
font_01_sfnt_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 15644 bytes
SHA-256: 247ea66f519b04c1ceba8d0147fc1a507c97948c8e6973f7d2ebdbb28647f66a
font_02_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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