Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7314c2bde9a2828…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 23:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 035aad01ed062dd11d3ffcb8d6041f5a SHA-1: 61d7f1370998385656b81dd3c1bb35ca09eee014 SHA-256: a7314c2bde9a2828544ab276bf4f285503156902992951d36ff9c877f75a8fe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress uploads, identified as a phishing or malicious content distribution tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0ad594bd---xonisirulamu.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a80b2ed49---rapewuv.pdfIn PDF document text
    • https://melz-feu.ru/upload/zorowigekij.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/20970930800.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210901071631.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161300d4e76682---69525968413.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/jolepunodazevem.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea901fd4c---kuzaba.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/labudutitemura.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/bopijeguxulinakujabibim.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/89376600737.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/texivamolevekamalazutevok.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/29296786961.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7b5d57bf3ebb0f46089bd7b0d8835e54/bosisakedital.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/togobun.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/84638985388.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/fasekimisab.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/23558845036.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/91450164239.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/71777517224.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/88641455778.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109011312507035.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/23315556634.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136d57424cfd---27486450790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=delete+old+files+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 18628 bytes
SHA-256: d6531d8f0d74e689e4cb50bfac015289ed7d3565177bf924c297864205e1f761
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 10348 bytes
SHA-256: 5f0218feeb91da79b5e2572fc0385f066d19c41627713e9c6f02df7143e73320
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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