Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0cebc7418fa2f2…

MALICIOUS

PDF

89.1 KB Created: 2021-08-14 12:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09cde0021ed66c0ed30e0da2369991f4 SHA-1: 033fafd32fec0c7143a8bde0304e2a0e2e955398 SHA-256: ca0cebc7418fa2f2437d189453bb20a919e19f6050fc884cacbff9d653cf5ee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple distinct hosts and the use of disposable domains suggest a phishing or distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kpt9ffarc3bhqh409rfvdod2bs/rekijuzigalufediwifesa.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/wemimaruwatokizavefebu.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72912206155.pdf
    • http://nepodoshlo.kz/ckfinder/userfiles/files/80597721832.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b599220e177---49357585265.pdf
    • http://theheavent.com/userfiles/files/41760437766.pdf
    • https://corpusbg.com/files/fck/file/90912817553.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/xedizapasonimejo.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/420fc7dba813253e05e837386f7c3283/riwamilasudiliviliteki.pdf
    • http://seamacros.com/upload/file/29883725135.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bumidoritofofojubi.pdf
    • https://101doctor.com/uploads/ckfiles/files/60c387a3bf74f.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/lawoma.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/metuvumus.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/63720575441.pdf
    • http://alnoorcity.com/userfiles/file/21443599995.pdf
    • https://propiedades.net/ckfinder/userfiles/files/86615339565.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3e994d36f23276fc2130ad674dd94efe/zepovepuruvedijifilemeku.pdf
    • http://shengnabei.com/uploadfile/file///2021071908001223.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f63cea90e0a7b081c6b5827eb4d6bbb6/wokatasowapowuniloponaz.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f411b86e---nefuvovonibunanodoloburo.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088058e6e34e---6775735479.pdf
    • http://kimhoatra.com/upload/fckimagesfile/kedesinevaxiworajibebe.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/49793276407.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ce2c4aac0b2c46d4c08fa35c3d1b91d8/1693347425.pdf
    • http://info56.ru/userfiles/file/zisejuvimufimasidate.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=luminar+3+user+guide+pdf
    • 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_off0000f90d.bin
fe1dd41de14a5ba97a48ade9e5930a00caa5555a0f7410480fec7f45bc19ffa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 10808 bytes
font_01_sfnt_off000111a9.bin
59176c9388e13934c3f546e0ad3099776569a185dc3f04668592c12455572d03
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16712 bytes
font_02_sfnt_off00013d35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D35 16792 bytes