Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c258d24c300205b…

MALICIOUS

PDF

93.3 KB Created: 2021-09-05 02:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94a5cdf5cea6464ba22f57cf41ca45cb SHA-1: 0cc58246a0679f234312cc894e76d31e8157b29c SHA-256: 4c258d24c300205bc2948961c22fa401037aa62218c177c0ef03717c5ee8e08c
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 link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2683d58295b6176f5305d348a2ec6dc2/fexedasofekowatatu.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/defedekedo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/83191904469.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0cbd5cf3d---tuguwogirajesaxa.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tivezoref.pdfIn PDF document text
    • http://millecolori.it/images/file/12346166495.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/eh666j0o0e5mht7dgj50ufb7j2/4506870310.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/42486353642.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/nabinepazosugalatigupoxi.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/kigexak.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210822151009113.pdfIn PDF document text
    • http://josquin-capella.de/download/70485101767.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079892d6e249---52609031768.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/uiliat6s78c9m6m1496dftadn0/gemunelasatori.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/80184363046.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/xijavujebeta.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac689770cf---45888077288.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab8796bb0---botiruxovebimibimov.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f68c91e6f77---palakovisilafoz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3d99f0b5---91601049400.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/jepuluwijez.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/remakimexokeropuvusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=skills+worksheet+critical+thinking+analogies+answers+renewable+energyPDF 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_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 18460 bytes
SHA-256: 20945c9369ad9b62d5c0c5d20476b4656fbd25fed66e499969b7482d1bac51a8
font_01_sfnt_off00013517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2E 11016 bytes
SHA-256: 12eea595c035c36bb03ea98053cd90c82e274a1864ef619cbfbcf998aa5e4113

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