Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee87a5126271640…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 00:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b063c0ac08188cdf57f7d84d7d7ae43f SHA-1: 17a2702c9b90ef8abe1018d7b006d21f904265d7 SHA-256: 6ee87a512627164089f1421937bd901e3351df1c18f58bfe0684b0a47a99ce9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the link farms indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://synerhu.ru/uplcv?utm_term=foucault+archaeology+of+knowledge+pdf PDF link annotation
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/47593533748.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160861abc63fce---73369648701.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609486ff721bf---2923899696.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2291429b92---93267500731.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/maramedeno.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823972e3447---kikudekuxagopejarame.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mafk6c30pf04nrs8ilk1f0q2e7/bepeleluke.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b0351c20---46262202382.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/kunozad.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdac0295d52---64116364128.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a53d6e20c4---wisogo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xeferovafonova.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/210193d320273d938771ed04f90bb4e6/bosekunomozitoz.pdfIn PDF document text
    • https://adikketiga.com/contents//files/zelotazosoraripa.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/wafamifur.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/cee0f454431136d4978ce70768398bf7/79647751203.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502011727326419.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa60fc6322---mamowomi.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/1fc568c2156f30a274f3a3403727b207/suxub.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/52640107248.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/dnd2hgap55p8rvcttqh4n41el8/xajiguzaraxafukusese.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429002156447030.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_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 11008 bytes
SHA-256: aa9aee330d39abda38aac1420377449adb2d1cb0338e828400712aaff1922256
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 18292 bytes
SHA-256: 47ef7779c70fbe7abef3bdbf74b5cf3d21e2795304f2887662de19ad0b46bdf4

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