Malicious PDF — malware analysis report

Static analysis result for SHA-256 31697fa37c7a547d…

MALICIOUS

PDF

120.1 KB Created: 2021-06-30 08:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d06fa2df012408276253e213325d43a8 SHA-1: d1426d50af943f7fd72bcfc7d028fcca52ff64c2 SHA-256: 31697fa37c7a547da3520ad2a13965f85e4ff322e8037dfcf1fafb8c67878615
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it may leverage embedded JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160826fcb26fac---72319070154.pdf In PDF document text
    • https://cafemocion.com/userfiles/file/94036314908.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/252ad75bd33404af50f56cd4e2f8b258/10554020723.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c5a0d322347e30f350ab5096a56ff505/zuwexi.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/81398240134.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1d5f6c1e1321cc4aa610872e4a233978/xutijeratu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d150c79b774c43b57805e3a0ac1be537/89902454321.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dqnu7b2ki8nrgkem3s86htss0f/27008001614.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160770aad8f156---pezudosaresosepubivudafe.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k6qe1glj22qu6adusb73se9bhi/wobotamapejuguxof.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841797e5f6b---redovezuxipi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd239967d---63508300022.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/86229653179.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160851386c9ce4---jademilasalaxedovazufaset.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/6973167261.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e2069bf2976e3e598298e656a4d9b4de/wanegetubolizokuloz.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c184c90215---bupupido.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a1dsffl7n1tbo8mtqng4fnknmq/tijemabaxexunedubawojopoz.pdfIn PDF document text
    • http://debden.org/userfiles/file/zumanaxaruduzowej.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076ac8b12fab---80245310979.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kidadaxuzubudepogal.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/40824735272.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8b1562babb9e86e23d3613872836c8e/78480444269.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33513c2e0---80827182780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=one+hundred+and+forty+thousand+in+numbersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 2416 bytes
SHA-256: 9d61e5af46905d5e1378c9412b21111c2a234b69030c5fae75a7aa99db3428d2
font_01_sfnt_off00014b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16332 16904 bytes
SHA-256: 8e7adab2ca277e7430996eb551d2d419eb4947003b203105a80f6ab858489a45
font_03_sfnt_off00017b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B60 24096 bytes
SHA-256: 5c75a5a8e1a0d61f13bd9ff457d1c0546a967f83cb2f4a26c9726ddee45cbe69
font_04_sfnt_off0001b8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C7 10952 bytes
SHA-256: 9577b1bb3d5304823b624c6e36d0616e09969d9fda1ad335f5c798783a2187ba

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