Malicious PDF — malware analysis report

Static analysis result for SHA-256 7360977d41b40aad…

MALICIOUS

PDF

94.0 KB Created: 2021-06-30 16:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bcbd740c6a64f9cb1f327f469734dd5 SHA-1: d03d54a02e75e51ab8d91ccbd9b61bb4eb9e6285 SHA-256: 7360977d41b40aad39c6c56ae592a58502d2c75db2c28d6fb98381c1c6c363ae
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing attacks. The presence of multiple distinct hosts and a high number of links per host reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d63598e816f---39067229260.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3b165e509c8b27a8c4a0409bcb3a686/98890926765.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607654c161fe5---matefupuso.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ehni276s9903sfl3jqpg2ue243/646311400.pdf
    • https://tort-art.ru/userfiles/file/wetosotiludafabetil.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071530742681---87327087934.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608323dc45aeb---50250538527.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9924ec7a5---40564239974.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6315aca81fc91eece2a4a4e8a749c348/95661377535.pdf
    • http://atut-biuro.com/uploaded/file/49627529319.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/kqv3dfolbqrekg3869e94h5ebq/wurimogapalaxexevosuniwe.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ffcbdb97---sinosub.pdf
    • http://chiari-web.com/ckfinder/optimist/files/46836470798.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/12046693564.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea1251ff---sasopudalop.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/kewebajuselebibamilimu.pdf
    • http://adance0112.com/upfile/editor/file/26495031619.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160872368da3e4---23217214454.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b164a4bbb---35151180661.pdf
    • http://eko-inwest.eu/upload/file/70442843814.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a2af749ef8304dd55fef3129cff34624/27654828231.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6af79f66---pawijuzekomako.pdf
    • http://hurtmar.pl/Upload/file/32779698878.pdf
    • http://3bbb.fr/ckeditor/upload/files/11787929115.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+chronic+download
    • 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_off00010c33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 16792 bytes
font_01_sfnt_off0001244a.bin
e55e528da505523e51fd851c49c72aceef380fd51fd95b65f02998e7741fcd88
pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 10252 bytes
font_02_sfnt_off00013b40.bin
782a75f3021ac9fc5aa945006a62cd52e2b0f0ac8fc13a9554d6a4dd6c560caa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 18196 bytes