Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b31612194484c6…

MALICIOUS

PDF

89.7 KB Created: 2021-08-20 05:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb1630b05e5dae4833288a5875639d22 SHA-1: 5c50fa4ad6d12b2e0f9a1cf2c8cdd0946260cf6d SHA-256: 18b31612194484c6d59aa80c2e4d3d521167cd96c12116d6e423a15b3b75f8ca
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm structure strongly suggests the PDF's primary purpose is to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://flavourit.com/uploads/userfiles/file/file/mejijigafasakone.pdf In PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/sikozoxivawibeselavorakuw.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c7530a092---60468947197.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/34408810836.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/tasuxofibodizajur.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fd823765e---46443118990.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db40b5a111---77790331356.pdfIn PDF document text
    • http://pasted-radio.de/web/files/93353880545.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6337044deec701141dc7475509abe0cd/farawepowivu.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/84f4f00f165a8f461fb36ead310594bc/60792834952.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/ziselisowulijepexupa.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/13692194893.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/51403977249.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/devibolukovuwutabeb.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/33920940588.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/80679745689.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/jukivijibumeb.pdfIn PDF document text
    • http://moristas.com/userfiles/files/7127092988.pdfIn PDF document text
    • http://atek-ent.com/upload/file/botopetinuwururazilez.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c7f0c6281---vavuzo.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/gifabijejarilubufuv.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/3648040671.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160766b00cfdd2---gusowivawewalewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=commentaire+compos%C3%A9+les+fourberies+de+scapin+acte+2+sc%C3%A8ne+7PDF 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_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 11532 bytes
SHA-256: 60b18bf983e69361eec8b1ebc75d5140c18679e5cfe1170186b97a41b95c0cc2
font_02_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 18600 bytes
SHA-256: f3cf03ee07510b7ace9495b4988a486abd3c04342e0c9ff3355839bc53aad3a9

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