Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ab47d04ca3e7ac…

MALICIOUS

PDF

74.2 KB Created: 2021-08-31 12:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 888f9c3672013161373a01566aaae3b3 SHA-1: 28f5ad848f2d1a28e570ba91aca3b9edf216debe SHA-256: 53ab47d04ca3e7ac4ebab4bb116fa5d4862e6389d104af5acc66723f620f9a94
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tranthachcaodanang.com/uploads/image/files/babufizenumozevewex.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3177b7d0---vodoxameji.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/601e4ca5b097fa6dd036df37d311b1d3/62924647975.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/be80fac054c171db67686e2b177b3ca3/gokoza.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/54889042513.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095752f7b19f---31262555101.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/xenoxate.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/saranobomatusemom.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/540e88fc74642e1610cd9a95f20cb014/wojabuvok.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/tosagu.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/lesedoj.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54947b574---52665871789.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5b4sd0tnbh2qmuaoqdgimmr2q7/papolefasobogudufu.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/wadotadasozaj.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcced6512---fafeximutapinuvub.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73ad35ef3---xiviwowuxaserusutegosixi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128575bd01b6---vafifokefefi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/499bae94a40aec7c044d4373513f3c12/88939481383.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/552cec028792c39b5c707e151fdbc629/31335026560.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5e12c1639---2234233690.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/woparorozurazexonokazuki.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749c090e1a8---52459566037.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7d0f37f2de6730cf8726539649bb9492/tunawejoli.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/afbcd840dc39d7f457e79613be73acdc/ximatozojuxuzakopavagewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=4+letter+word+with+olivePDF 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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 10044 bytes
SHA-256: 7843cbaac0e5c74fc62e9ea9916ba6c31d95dfb5dd6a97092db47c5a222b8498
font_01_sfnt_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16060 bytes
SHA-256: 8dcd0f679fd1d2d2ce06e9da70e029a658ba20fe0fe1e52763d12f7153b6810b

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