Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57d36293f5daba0…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 04:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e12cb26c2713b19934f73f482377851e SHA-1: 93db0a8e9d53082511c8b90364cf4fb46d9425b0 SHA-256: f57d36293f5daba04a3f8236e72fb31f0f4749e453c0a9dbba4d862dad7b547f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs on compromised infrastructure points towards a campaign designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/aec639d38f3648ce80da3f5325e77b72/fewerupenogilusifila.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/uad428eksl9ir76v5nuu5kkun4/84923885744.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/namujonurafufuge.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/271bd63a356c5579cca392f6b88032fe/62185965010.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/134b7c1ee33870e46d6cc34b5311fbe6/30964819914.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38061d296---38126319285.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/jeniwuvexodiz.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/kaxoninatog.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/37947069935.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/kuligidupagizedewuverajo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/55239046733.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/643518e35d479dc66191a6d5adfb593a/32292350401.pdfIn PDF document text
    • http://atek-ent.com/upload/file/sujene.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a9886b60---40012986694.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kakun.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/77182733382.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/70608805548.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16229132083744.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/rorugojamakuzugafit.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa0d8bde8---71942454039.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9s0snd2i7jh9e52ae5al3h78q3/rozozolirarivuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=uyire+hd+video+songs+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 17344 bytes
SHA-256: 2b4d2bf1797567ab24c029d7e83837e44e7b35d2996e2baa0ca3964331446ba0
font_01_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 17076 bytes
SHA-256: b0d5d9765eaaa719ed55d9605555a5645c4da0ab8ca40e0724129f2422bac012
font_02_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 10700 bytes
SHA-256: 3859b64fe3d64fe7fce99261e5b7065bfc723c7307bbd298dea2128e5faca167
font_03_sfnt_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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