Malicious PDF — malware analysis report

Static analysis result for SHA-256 999a2df0d7ee20be…

MALICIOUS

PDF

85.3 KB Created: 2021-08-22 06:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f4afa0b36080a78becfb5e7a6a2bf5a SHA-1: 7afa02a79b8db4d43b0dadccb4e21a6ee875453d SHA-256: 999a2df0d7ee20be39ebc6a22b3c86b210b0c1aed13f7f6142f1a6f58557fbd1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=como+imprimir+comprobante+de+pago+de+pension+imss PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082b47e1ca27---66878467110.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00bf921558---panimedutojalo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba252f103e6---pikikuwofuwovewe.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b074c20a274---sajorawatesegudorigo.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/57530103319.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/32ded11a8f577486e2761a67ce98be0c/wezesevizu.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/90742867361.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/39437519168.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/vitajisogimitavotolavijo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b32fa003ff8---83513799625.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44eb720d2f---rurovi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/afd12f621623163a57d567b2ef3d4148/11478314260.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/77317613272.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/eehicc1buun9murje0l9b2g4k4/82395844774.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210701_184334.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/timajuluw.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menodariwepo.pdfIn PDF document text
    • https://nevisnews.com/userfiles/77780595700.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/35957794805.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/35742129153.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9645d4aaf---mupesowamorexuminuwaw.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/55889048634.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/bapepujulebi.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/2a684c7b9267b44dadc08ac168c0e60b/jetixatorozafogotofusuxu.pdfIn PDF document text
    • 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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 18252 bytes
SHA-256: f00d68c284e8b2763528bcd60d5ed5ff86d8243bee480a694567601f563ebed6
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 10980 bytes
SHA-256: 57064d7d147cdd9e5284a80b857aa501ca524830804ee55374a757fad5357781

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