Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4537460d0782655…

MALICIOUS

PDF

78.3 KB Created: 2021-06-01 10:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e673bc8b586d14e0c6e350790cf24def SHA-1: 1bd97f3be164b276e6439352578c5dc180644f55 SHA-256: f4537460d0782655c0c704a4058424de59cb051b920c424317778a9878cd125f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ccc4ad231---66363706192.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/358105971474f729399f3421ae80e086/66984217028.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bd4c7f9657d3f35a7a12c3339311f2ab/62245936425.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ke2bfteqf4of25vjomvg0lu421/94781719481.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bc76384d59eb14cdb115bfc26749a1d9/lubuvejotive.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/54551212253.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef77338e4e---50721110479.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105091911507076.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0b37f789---gikibawuzasokosobawej.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5b2a42cff353a50a37022688d3af6e86/nefopiwibariluwi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6364ef6e4f6077047f548236f4001dae/pilotudelomidadu.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/fakotizepojo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/q4i0gk66s61633vn8vde8viokf/judulizuse.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c12e65f8aa8a339a8d4a29f960e0be84/98470795989.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18eca18ea---judapunizaxazom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=grand+summoners+what+is+support+unitPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 5172 bytes
SHA-256: 7a1c0360a6bc008c82e1b015daf65876797d411d4ff2be3b68d89e78ae6ad171
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10804 bytes
SHA-256: b02eabfe9e90e12710817205de679f80b93e271ebdca44c0d38c9673ff794e07
font_02_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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