Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa34544dd578d0d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 04:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52562f554d6930712bc5fe8b166f2e24 SHA-1: 0b79f184ba21cf659f3c959bb5d4f9c671cdf2ab SHA-256: 9aa34544dd578d0d6ef345fdf6a424bf0259d6a852f62c7fdc03f81a1d3fb3e1
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 compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these external links. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qsep5so8r9t2bvj0pboqp3u5cv/lemixuzizigivol.pdf In PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/uf6ueqbjajec1hfa26e1qvq0n7/takifawatolim.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d917bfaa---lujaj.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210630110312_624323550.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160766ce471a24---57194312243.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/fd56563a980f311a3db83ed02b95e43c/90444784819.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/velopodubimakaxevilekuv.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/35507394947.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/76535304279.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/rakozunutali.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/weripovusofalar.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/8637220860.pdfIn PDF document text
    • http://15881588.com/ckupload/files/suzojotamiwimepusuzoli.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/724af4663e39c1274a8c1b78507b597a/pokanujomoxegib.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a456440e0c0---10784592804.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/gopudubi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7ccdc119---luxokesibenejusonofuxa.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/tuzipegunezirumubogenuw.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/pukexogofir.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa2ceaf508---varozatofipipuf.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160925b02254b4---65233131274.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16295755369845.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108101057091880.pdfIn PDF document text
    • http://didopack.com/files/faxevuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=rebobinage+transformateur+pdfPDF 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_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 18856 bytes
SHA-256: 65b44650e282ec54aa6b2da17670f04c1701fa54092461ad3896388967e580a8
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 11080 bytes
SHA-256: 437245df49d35d8e1074c8b81acecba149f9fe3708d69a5bc40d2f03e46c52d9
font_02_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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