Malicious PDF — malware analysis report

Static analysis result for SHA-256 683dd48f34f4f8e2…

MALICIOUS

PDF

87.8 KB Created: 2021-09-04 00:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf25dc3f451558ed4d55626fb7569da3 SHA-1: 0b59e1924bad012549a4ace687a317bbaf39a9ca SHA-256: 683dd48f34f4f8e2d4d80b7deaa9c4ad86d2627031360dcf7bf88729f644e96f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and the overall structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/00e688fbbeeb607fd876dd07dde65328/xofupo.pdf In PDF document text
    • https://coonvalleycc.com/userfiles/file/mivagasuwipe.pdfIn PDF document text
    • http://schokobrunnen.com/idata/lubugudilowakitixikas.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/vafadazaduwubidej.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/74970594303.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8b25lqp2ovccnmbem1tbubnpuu/70538157608.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/10251863634.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a7f084d7cd902f08139f3c8e69af8067/zugubulepafani.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/jdv0vk40dc1vhsdht5ppkp9224/weworufid.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/lebavejafireke.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/dulegodilu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9h4n6febabjcabnsfiolvhfqt8/jererarobumi.pdfIn PDF document text
    • http://montesantangelo.it/files/files/wudizopufilagejamupexob.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612465939bf72---sefazilola.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/gujivedegitefin.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/lageleriga.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/gudukanaduzupefi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3db1b5df7---37996072974.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/35822735581.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b23fe8dad---17969885042.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/fewugiduzozedefixiluxatel.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b146324e1---lakedamudejurufokogakexo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/st0r9r4u3dqrq2fk2kskbu6k02/dufimigobavev.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/36890546115.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/medutarusejizusisiluju.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608294cf79a6e---tebulenexitabuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nanodrop+one+user+manualPDF 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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 10440 bytes
SHA-256: 56a7a9bc7ef445d29121c19c932a89a0e2886cf811151fbd77ac2217d2ae6ea0
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 20032 bytes
SHA-256: 68533cd2ed0a0731fea4b218ea1f9fd6f6f0528295f249d4cda44fd6181ec29b
font_02_sfnt_off000139a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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