Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d77e8284bf6fb7c…

MALICIOUS

PDF

109.4 KB Created: 2021-08-05 22:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1922c65ba41fdcfb9b887169dbb5d9b SHA-1: 96dfddd8a6eaec0649702fbd97960c6025ffa5e2 SHA-256: 9d77e8284bf6fb7c774765903af90be801a2faa95a3ac9c956f4fe4d6e6aa25e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://ahcxdq.com/uploads/file/041253536914.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdf89edc0---32142083885.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/jeboseta.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/11d29bce8a1e139dc2c6539b488b70bc/pifufu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073609ed1333---pelogasaselosujuk.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955172b251---lotabimanelebapome.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/0411abi5be1l78qunfgms7jp56/19765780266.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aea99a1e64f---fojipepusip.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3ckmop55fobfbop9sfk0qjgljb/13037685664.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0372750b6e---zekopimitobo.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///3246226430.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091e1c249cbd---miwobitidupapazafifege.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/23961466886.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/dukito.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061520072373499.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b70cb4b49---58044389610.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074341a626b5---jiwamogenotekanadajokeme.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/194155c79781e8848a801d3c1b29f8a6/pudolevepijujib.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/040a60a6b101573488045e99be9eac99/puvexivavafizukerukosug.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/56358796923.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/nelitebarupubiwiwujekewe.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/73441139285.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/4189504785.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/71958159625.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3093753e2---tavapidava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=florida+barber+exam+study+guidePDF 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_off00014b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0A 10920 bytes
SHA-256: 1f4cf75888346d16c5041d9b40779f5fd4491c5eadf330fc9293db3375dff9bc
font_01_sfnt_off00016426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16426 16804 bytes
SHA-256: d59c6c832281e1f2771ef9ae69c6dae408d338df893e20ed5edc9a68d7a67b20
font_02_sfnt_off00018f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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