Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ecd86c05fdf87a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 12:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c434c68771690caff12556b8fe281d98 SHA-1: ad6c466155d66939239a88084f84fabd6658fba4 SHA-256: d4ecd86c05fdf87a3b4a57ce071f0361544bd6d12b8908deb30539623c909065
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The ML classifier also strongly indicated maliciousness. The file's structure and content align with a link farm designed to lead users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607942e75411b---mixekotijipegomuk.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6ffc450f---18989691911.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0a55571d4798cb8ac000e57a0ef9711d/42392609838.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef5b96023---89478795840.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4e7c2c37aef162a73e810dc42b9f6ff2/gijenobonifadiduwuvazibi.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/2795276362.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e93d84d6---sovibudorugukar.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/62309675818.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/gemota.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b0e3308816057939e6d560a4e82e40ef/xopimivaganil.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/3pemd126n6uiefchmd6hjfv03t/xoxepefazabijogorak.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/sopejeroba.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rarujipesofawe.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/17252321982.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a5d383ae2---42335014025.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/wanunalijokiwatokade.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bgp94a9sdrccc0p2dkslu32e77/72823989521.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d770f6ae1b6ba89165b7eb227506cf4e/67897419726.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a395aca2fcf8ed06d66b5d18aa8257c1/lojetipekimemiz.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c823e09b---bifarelu.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/romomajasiz.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/48362009405.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4c727276---minosizadeko.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/47552019184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=edit+pdf+document+mac+os+xPDF 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_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 17764 bytes
SHA-256: 4e43cad9c68ead7adf1ebdb738d2273f883b893571c3dbb2cfcb48cd7ee6153a
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10820 bytes
SHA-256: b4cadb47f156ad97ae56429203f01fabc1df10ad099205becf38bd207c3e6675
font_02_sfnt_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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