Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff632d2e49ea1930…

MALICIOUS

PDF

92.7 KB Created: 2021-06-09 06:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b96e11cb3a5c7e09b7ecb8d8b69e4ed8 SHA-1: 76ad89fcfefe17e346cf70ac8a72965bddce70a4 SHA-256: ff632d2e49ea193062f27777640fa8a8f8d51d8e4924e825c60d3235b15e0c21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=types+of+relational+algebra+in+dbms PDF link annotation
    • https://mszukam.pl/dat//file/bedinoduwujirujigegi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abfce4a3b3f---vudeja.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f496723ae6---26836197527.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5164b26c3---47665898432.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/17515485820.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/jonenake.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/60719142995.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ed464a7b---buvutijewofezusegu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080e54aa5981---23593482831.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/5qd73r7ls9o59ojr85tbcaql8u/vasudorisokuzaxijekijavex.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/dozugojefulezolikapomisa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1ed26556---tilulaxobokalevogevemuro.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160715b7d34836---4810105794.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd077edbeb---97086275343.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/589d60ab7f42bcdc5c264fcebfae63f2/vujukimaledugu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/98f036be82e6a3771783488cce8ad0aa/2715679262.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6f7d8e60---girudinaju.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 2144 bytes
SHA-256: 275b095ef341f37669aa85b334ecd872ef16e2e4b1a3f13ddd569d719c3f6582
font_01_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 2864 bytes
SHA-256: 3eca900ccc2a6e91808c137d8d9df18b90fbaf273a883a1a641f7dc1b87e2255
font_02_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 5552 bytes
SHA-256: 47247a03f79d631123718d6d85b1d5c14940ac5a0c36cdb847d8ad73aee8e094
font_03_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 13108 bytes
SHA-256: 1df81c3efc059338f4ef343d5792aa950996a10985d2c38d39c7afedf7125f63
font_04_sfnt_off00014c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C39 17064 bytes
SHA-256: b933768b5023b0ec9e28c167f8a35e1d2ab4edbc1db3901065725058dd6908a6

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