Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87eb8d81524e275…

MALICIOUS

PDF

82.7 KB Created: 2021-06-10 21:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c50d7e9ab9dc90e21dc89fb14ac1a2a8 SHA-1: 36eabf23545b205fa19ab1814124ef29ab9470bc SHA-256: c87eb8d81524e2750e4a90dd8fe2a56ca471ddbadc780405dd783365b4a259f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious payloads. Numerous URLs pointing to compromised websites and disposable hosting were extracted, suggesting a link farm or download infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://cructi.ru/uplcv?utm_term=bootable+macos+usb+from+windows PDF link annotation
    • http://allseasonsart.com/uploads/fck_uploads/file/44156252172.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8b2a5381438d0a627bff5a61c82e6c81/bupediwixebuximavuzen.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c6d53d44---wajugidikarerodonolunode.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5adf9ba5b---29794331512.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070822837979---nujakeforifinakebemoposa.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/tavavusipufutakalatoro.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/lusuduzetalo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072afc358e69---36873288301.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af82720a567---40066253712.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b010ad731---26201103469.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sufesuril.pdfIn PDF document text
    • http://446888.top/userfiles/file/kusobamekako.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/buwetigefipigokubisevafob.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5af7143724abc3dd3f20aa2e7f5b9051/7816113203.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/45275724009.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8d178444---mafexonovotapafoduzafi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/dambln9stmg1ebrfvca4kla0cb/71293316571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 5448 bytes
SHA-256: 1d81b1e961c0b11e5218489bcbac826551a5a8abb72197f6eb4ddae5fc2a0c90
font_01_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 12068 bytes
SHA-256: 5653449b4179ab9c6c66b06417a3f31f7949d4f9a3318c8a6b8d1aa87adff66e
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 16092 bytes
SHA-256: 02d633d18b4efb222d06cb19cffeedd67924a627ef45dadcb57719ff17a75919

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