Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e2719bf837af8b…

MALICIOUS

PDF

101.5 KB Created: 2021-08-20 09:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3cb5f51782fa3d1c3eb928a62b83513 SHA-1: cbaa051e4a6333468e7868b730595e0695263523 SHA-256: a3e2719bf837af8bf867ed63eb7307efccecf5a0fd5821e8eef7bfd07423ec29
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document's structure and embedded links strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dabaizhongxue.com/upload_fck/file/2021-5-28/20210528180043673253.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273d899602---37425817843.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/89319788920.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/94c129efc5376099027b95edc1b70ae6/70324611269.pdfIn PDF document text
    • http://tochuchoinghi.org/files/12173390344.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/14713753309.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c604e864954---96347382114.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/tepomesu.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/33141560834.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7ab64f794179d7a6af4fe2bf4bf4d925/24144780646.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/97299879471.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/31935641812.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/55255261413.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/rinifunidesaf.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/xojowujaled.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/gepem.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/77788203989.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ef90ec40---gozajexo.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/86487510534.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/150bdb0db10bfa81a207468cf6a7de21/dujuzixakuw.pdfIn PDF document text
    • http://skia22.ru/pic/file/xukasezonazebebaz.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855fb556b23---gofezilimosulobokubokafu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4ea86c73fb7df2f6a910d4135b1f2a07/kaximepij.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609252db1d05a---wezunajexida.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lodolisuvizixaxiziluwasa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nrgo8t36v6pt8dmmj8s7eo6hi3/93298009478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ejemplos+de+nominas+resueltas+folPDF 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_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 19408 bytes
SHA-256: 9c10382b2ba67a5319f603eb9196c9a23be048dd72b3c8ffab1899c02a97344b
font_01_sfnt_off00015499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB0 10872 bytes
SHA-256: 433d13dc8d1332f61cc4de5fa7623bd1d89a601b79d3f561c3c08f2a1651f213

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