Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd09dc26fee84f8…

MALICIOUS

PDF

102.6 KB Created: 2021-07-06 08:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 71829db00c1c20a771a5a501afec12c7 SHA-1: 90e289edf46061636529799755ae420b3a97c122 SHA-256: 6bd09dc26fee84f8dc79fcea8ad388bfdf2049e1f2616de548b50b9cff715930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to lure victims through these links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://cohensevents.com/clients/74638/File/60795831827.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb71661d2b---rubuxilim.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/2tpr0oc0tetnaqg11sus2c2291/vofazoti.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/donomu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/59891184566.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8508388b5---benomidud.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/33420462509.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/venenegefisufurole.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/13824629428.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/au1cp65c2bj0me09t92jpgm57p/32063602661.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/696c3277295ecab93dcb388f04fced66/pekelawuvax.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/970djn6d6ksgbcglk6fmer6v56/wipodelexevafoxiwil.pdfIn PDF document text
    • http://cga82.com/admin/File/93265856832.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/s4rqh3s1fl1qu76v7s2igo0fa5/matukegoxavosadan.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/17356733858.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/59086265012.pdfIn PDF document text
    • http://waypl.pl/upload/File/5836901580.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/90570882183.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/139d307e91a2137072af5fbae6b32d40/zubusuvuxufejelegi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b7fc9ff5---29344232560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nelson+oliveira+cyclistPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 22540 bytes
SHA-256: 702b529ffdbba7706fce7898fffe78f16f83fd5bf248c0bca58b7d3750811f0b
font_01_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 10380 bytes
SHA-256: 159453b9d842c9d02abebb5b4b30eb34b6f7136aa02790fb6ae1472342b40aaa
font_02_sfnt_off0001404c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404C 20804 bytes
SHA-256: 74a3e5ca03b426cedf6726bfe657953bbc555a546d24653301d2d66eb4b4875e
font_03_sfnt_off000164ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF7 3612 bytes
SHA-256: 8f86f062cbb4a59fcbe65d148e98366ba67cc705487cbb3703272e3147c88768

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