Malicious PDF — malware analysis report

Static analysis result for SHA-256 793bfc047cb3274a…

MALICIOUS

PDF

72.7 KB Created: 2021-06-20 04:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 109c88a195e9239210169541d4fcbced SHA-1: 075a2687992f66f8015fa42da933d656025a37ae SHA-256: 793bfc047cb3274a25c1523d807e314da574ad68ac1e335e99479bad8222cb03
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity is the extensive link farm.

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 https://philabc.ru/uplcv?utm_term=watch+love+online+free+gaspar+noe PDF link annotation
    • https://edubox.mn/uploads/users/0/files/lovivafojov.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/699d8a2dc5947e284e2e3f1dc8d6b080/20414785418.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/misememaxosesubabawim.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/44078430144.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/79284049049.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/52e17442a0b7f834d44e51562b19d835/89663266267.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/28vks100np5r633g5c9l2c8ag1/furivimosusojudu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/70440357152.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/1s40q1i88o4ue4q696roba7t5t/15531552855.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/60073895295.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/25303748207.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/kaqs9965r5pteaq8ot6tslinj6/wopopu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wiwawelitarutelovutuzavu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2eea2f32f2c49c37020ffbfb1ed6ec6b/sizovatamuf.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/gipanape.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jaseb.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c319326236---68362814599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 5352 bytes
SHA-256: f52121ad94543ae669a23e748335a04625d8538cd4c321e06ae04bce43a0c884
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 11296 bytes
SHA-256: 0b9d504e6da4aa3a460f297dd4c7146049f67260996b20026a64dd2e16bf2d19

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