Malicious PDF — malware analysis report

Static analysis result for SHA-256 010039502c1768bf…

MALICIOUS

PDF

140.5 KB Created: 2021-09-08 02:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f9fe3e518fc5c212f25f36f3d82a40a SHA-1: 0ee4ca6a8561005770cdcaf6a7c8f97113fe749c SHA-256: 010039502c1768bf05d90e50283bd54c5d759dd0bf5c62549a36746e36056b41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf714c55af---29059034566.pdf In PDF document text
    • http://vigova.vn/Images_upload/files/bixeredubexovuguvoxaxabej.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/nibuxitesugebuzumepa.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/12886851965.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kdn9uapsqjtp49pel4r2rvbq13/63956464681.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/74897041858.pdfIn PDF document text
    • http://voijin.com/userfiles/files/57818125145.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q4h8pq1lqs9iitobchqpvnfgd0/zopason.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd6a13cdb---27307307311.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/25175538625.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/77308190810.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/pefakusifonej.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/74c11d45850b08b268472379860ceeea/tanesemulid.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/forunula.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/93845226018.pdfIn PDF document text
    • http://rnralpha.cz/res/file/64999387911.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/pofiludajolomosirelo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f955c59a40c29fedfa2113355fd06aaa/91979590956.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/60632462391.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609584a4e2df5---16553632987.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gieui0hmoqmlbi4lqk893ekbuu/pekabojewozedetuveva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tratado+de+economia+politica+jean+baptiste+say+pdfPDF 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_off0001c1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1C7 11128 bytes
SHA-256: d2a98e2b276ea5df7cee3bf1aceadfef9672b84d16713cd66c168d1c42468b86
font_01_sfnt_off0001db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB6F 18960 bytes
SHA-256: ef63ded1ec6f6028be19219e6999a9f37136ffdf149af60ac87323eb99ade8d9
font_02_sfnt_off00020b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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