Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b4ca6ec4aa9d97…

MALICIOUS

PDF

85.3 KB Created: 2021-08-12 13:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 345f3fbe7b3230edb444c79690c37924 SHA-1: 936a8740f715a850febe232edfa8350d6ab4e75b SHA-256: 43b4ca6ec4aa9d97c02e9875de772c0b6b73077d010653567a4c26308db45774
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41cfb72d41---zinetolazasesudumub.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7df0fa8dcf09402e1a32d9191a6e7bef/zekeguxalamuzowajine.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/govanoxavidalapet.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/pafogivibinidofazedapej.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb9f55255---71747674412.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/vodapojirijuborewodededas.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079284be2772---kobariguronikifadi.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/68480523602.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/borazenaxosubaxomim.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/lurav.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/91131326379.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/u9calnsjeu2ergsfjk6ed1a2dq/67941412515.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/waxirezazewuxulofaxor.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a598761d487---85676765610.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/989df4d9b67bd7deac2bfe15b8793251/86259902495.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/92087508020.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7068235498---xumifaga.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be1503c4f---geboserikuvemisofa.pdfIn PDF document text
    • http://iphysiology.ru/upload/bowarewam.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/65528266140.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210803143333.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c336a6403---japuxibobolegetagesulagod.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pokuvonuwed.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bha95p14egkckonakfa1ajte0/fukavow.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hohv5m6jj9mohm54g721fbkrn0/96842942271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+libro+los+malditos+jesus+lemus+pdf+gratisPDF 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_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 17968 bytes
SHA-256: 4fc9bb15368808974cb8882913e6b53ec4e014a15490c4864518e4b427b0361e
font_01_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 11232 bytes
SHA-256: 263fd5cfb068df391edfd703c4aa2c1797430b342bcc1d7ad34ca63a9a3cfc26
font_02_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1