Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3a1c617b0a4496…

MALICIOUS

PDF

82.4 KB Created: 2021-08-20 18:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9510efbf42327ff04cfdb5a96c97b6f3 SHA-1: 076540f278ad9269f63726f91536d0804799aac6 SHA-256: 6c3a1c617b0a44964af74e1bddb572509a983b4209642104144914e7c62b7708
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 potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/df81888c1a0ec7602628c7519784481f/36112092965.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/xelubifamepegumikusan.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/rawalux.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/208418382760f18fe6eea19.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/7561681769.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/75741965903.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8640651d87---depezirukixulodojegep.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/16858738870.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/ruribopejiwire.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/60227567129.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161185c85335e5---wagimujejejen.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/porozevixaxixo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8bab81b0---poferovoru.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/makimixelejetikem.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e3996da8737bfe3bdbb00e350550556e/viwigedebader.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f09af279f2e---jexujiwepisajirakuvu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/44298641224.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3e3bef85---79278277381.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/zapobunasomewoxojoxifu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/110bac4375f901fca65ae6b1783c3469/5220023072.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6544e81d0---wubizusu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/75966566086.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad1030f0b9---kexapeno.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/talemiserixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=akhiyan+nu+goli+maar+diya+full+video+songPDF 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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 16816 bytes
SHA-256: a3488150cd4f15a1a363bd8fdc85a113f2c2193ba066f0184c45f97413c77c81
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 11056 bytes
SHA-256: 159d28222398451a40f6d5f1c5fcc6b61c09f52ec99cdd17051b339f3c0feb0c

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