Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25b36886825bf72…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 01:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84a6c636e3d0e427daadaccc9605b343 SHA-1: 013df7ddd1b04d917e04e39fca99e14972ef5414 SHA-256: d25b36886825bf722ded6296745ea8f6a321b50926305bd066c55828150d0d48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16f918997---bitefede.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ca9ab87a---76653795839.pdf
    • https://sindonis.com/userfiles/file/gedewasadimodub.pdf
    • http://iehyun.com/editorupload/file/35118849544.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ij0a65ea92lvifiq4it9g4joo2/50679766934.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/satirosefumokigaxubesum.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48bc21f39---tures.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6566913c9d.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609444766485f---77558560992.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32f35db7d---57246144536.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30cd8e89c5---73384091665.pdf
    • http://aqbnb.com/uploadfile/file/58572378885.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/29576475483.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f88317a6bb2bd310b2ffd6d87c5b4eb0/76587880502.pdf
    • http://anandtouristcorporation.com/uploads/tiduxexotaxefugodefoxela.pdf
    • https://areicon.com/images/file/niwaxifajokad.pdf
    • http://mispuntossaga.com/campannas/file/41801163463.pdf
    • https://uleiuri.ro/userfiles/file/51092060485.pdf
    • https://bobecoingatlan.com/uploads/editor/file/94454383537.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ps0i0j0bk9gq7a80lfv1n0hdv2/39385890940.pdf
    • https://betenenergy.com/sites/default/files/file/pofufefesisinidosilozuju.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7f68fe62---56242251545.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3631ac14b7d66b095821ed4b986f0c67/41530408472.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/65ca2b44bbc42bb5af70a8c7751a36f8/pelalowatigadatawuragi.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/fuzavegijunovinitabana.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chewacla+state+park
    • 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_off00010087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 16792 bytes
font_01_sfnt_off0001189e.bin
fe4e740259d1dd7bb1b21bd5fb8b08d4d15e852a5eb9ee677f9544088f8bb8b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 10364 bytes
font_02_sfnt_off00013057.bin
67a87c477736ab6797a15c11603f4982408248cc9699ccc3512097f14793dcf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 18256 bytes