Malicious PDF — malware analysis report

Static analysis result for SHA-256 84590dab8b9d7c7d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-26 20:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22e5a740e37759b71ef3bef044422fe6 SHA-1: 82c92ee01d09a6d2b43b2d26c0edc8f728c39e2f SHA-256: 84590dab8b9d7c7d7372364726d1c2042f344b5bf67ca37fdcc67e01702ec1e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ikkosushi.com/uploads/files/55117568755.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307357612ae---43423449619.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/11080005383.pdfIn PDF document text
    • http://grupophi.es/uploads/files/kixejaroxamolatu.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/80345091501.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23065442119.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/bamim.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/jusonamiz.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/86422303988.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/goterubajawof.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/lufobujegaxudole.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/xusem.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134db1739edb---35161574030.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/jefosisepajupamixujutuvu.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/87892459485.pdfIn PDF document text
    • https://nomortiga.com/contents/files/wefape.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210906145140_dGV6YWZhcA==.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/97635211372.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/3521105276.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/gonitefaxilajozawedirox.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/kafekawunutumatavopiji.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/daxaj.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16130aa7c5459e---zanulewosalipetebufuzir.pdfIn PDF document text
    • https://robodom.si/files_vsebine/sexubilat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=where+can+i+watch+maze+runnerPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/fumagodudesaluvemoxuk.pdfIn PDF document text
    • 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_off0000bbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAF 19824 bytes
SHA-256: 74aeb043c5515a73c8052593dfba48c23a3b029f9fc74ba851b78ef49576669e
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 10400 bytes
SHA-256: 46ac8c8f94678970e5c9e9790aad9dc3bb1f1da0b81b5fa88861039b9fe5bc8c

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