Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cba1aef31a2c0ff…

MALICIOUS

PDF

107.9 KB Created: 2021-09-01 06:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ca85a79774a3098dddd772e8f4c8681 SHA-1: 6316548966bab46426b8bcd4ece8fcaa9caf7b86 SHA-256: 1cba1aef31a2c0ff79cee6a3f2d80d0132eee47aba837ae9cad05ccf7d2ecfc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://beiwendq.com//data/attachment/file/21179491806.pdf In PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe6417db8---bomitu.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/77977933082.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d80c84f4865b358f8331c9ad39f5a94/31184024624.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/foxaloduma.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b173defe38---88137344617.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/xozezonabifobul.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcbfefe00---15001174950.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc9978cdc---rexopol.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f660c2d98---punuredeweb.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/puxumef.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac74a6f99e---tudanopaz.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/towirigegalerej.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zipusuxekunuxadisipen.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2c6fcfdb44617c93a5387e4025bee5f1/47250004510.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/fghe6mpi576h0aq2m8t8kf8185/nurajolumafiruzigox.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/guvuxajojefemuve.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a816b30ff1f---58180173223.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/vokarotoli.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/10477224214.pdfIn PDF document text
    • http://veitali.com/upload/files/kesudonefeset.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/46856307436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=metals+are+alloyed+toPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 10152 bytes
SHA-256: d8fc2180033d777c45401dda7a655faa3a6f25d0244be552251d83b979f7fc6b
font_01_sfnt_off0001433d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433D 18004 bytes
SHA-256: c2694b50bc0eff9a4d80755f58322bafb70137d12b9789457e8e014dff809d5f
font_02_sfnt_off00017142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17142 16836 bytes
SHA-256: 645820c595d4038498db028c8b5d80835908cfe6b43d33359db03e6d05944cee
font_03_sfnt_off00018986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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