Malicious PDF — malware analysis report

Static analysis result for SHA-256 971fd3aa241968ab…

MALICIOUS

PDF

94.1 KB Created: 2021-09-14 06:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cdcfcc61d47f12375397900f77732fc SHA-1: 4de6337dcd8c7a5a405ab6f7ddb9a6158ed28f3e SHA-256: 971fd3aa241968ab25d5b3c03df5bbecd25741211a6682ea95cbda93a7395394
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users through a malicious attachment to access these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.boldino-hotel.com/ckfinder/userfiles/files/mizenekekeferulam.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dowuwone.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/3019005347.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9eec18684---77974831039.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/60122314884.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613150fe76222---pifova.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vuviti.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/nuxivove.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091117144489.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/woleriwagufebinolugefi.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/zojezikew.pdfIn PDF document text
    • http://philipsphotographystudio.com/tusiru.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/73634960292.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/39527372741.pdfIn PDF document text
    • https://suncables.co/images/file/dudevukexinigabo.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kezumijo.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/xesikujuzupaseputet.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/vixufutaf.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8842d9f6faf1f41622a2615278d48e49/jerela.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/wobatujajowutibemepuz.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/wopezagukadubedofewivuma.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/bibefolovevemopotimuke.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f0dd7b16---jiwidilogidopuwiri.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/parijoxobugovakuvonigone.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/92284025375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=interesting+words+starting+with+ePDF 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_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 18912 bytes
SHA-256: ebd48c9330125d03d974a66a0764833ce4d617a38529d85b10ef9b8291500ddc
font_01_sfnt_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 10516 bytes
SHA-256: 35bcd2eb9cf641e282d39957a6291a9e608eda074c8cb1a4a7b58c622cf2ec66
font_02_sfnt_off0001527f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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