Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bccd7a9b28fbba4…

MALICIOUS

PDF

92.4 KB Created: 2021-06-26 02:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 07913360ae77dddb067a289108f91403 SHA-1: ad86de8078cc7f8104b2b0559d38e527a8b013c1 SHA-256: 4bccd7a9b28fbba424eecf70896a89c2604a93a413bd8d91378460e23d8c5ff7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60559d11b---34490251047.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/54268192731.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f25437e2---55694310826.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e90634504---10295157677.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/23820456227.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/12855038611.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bc4ceef4---12483842485.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bedb147bd---rexib.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/icqiuhsbc3ho33jh1gqfg8u8oo/muziwisopomi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbef206895---70086365975.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m7mmb3hmtkh5di87p3gn91vbuu/95924782449.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6926bed320da0fddb8e556dd7960dd66/vegumavofenazusa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af885551a8---92973089393.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jnojp5qko662jhrha3j4tm3q72/sitavo.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/da0363ed2e0d49e0955f6022d0b3f5b0/82780995175.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/18aa27bfaf5394dd460758a1d256b8ec/48376119206.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/peputebo.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/go7g6c4ki6lkl6t1cq6vvkrlkufrq1e9/totuzizi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608159c831e6e---86376143340.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a336a328---garafo.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/78705530869.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071495005df9---62658092364.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/xumituvumiliwaro.pdfIn PDF document text
    • https://everestart.com/images/stories/file/41320346636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=some+men+just+like+to+watch+the+world+burnPDF link annotation
    • 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_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 11256 bytes
SHA-256: 8eb5bd15f7d81a6afc64719e2ba76817565a4ded3722bbdbb2c3d03a9f915a22
font_01_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 17048 bytes
SHA-256: 9b0469681223a105c7e62e1fa89d2d65e34a806651ec18d4f071b0db561ce847
font_02_sfnt_off00014c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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