Malicious PDF — malware analysis report

Static analysis result for SHA-256 df77845c3a694e26…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 06:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29d3a83c897c32c41042c919c2cf9671 SHA-1: 09ad273ab1a7b16e85348b57ef78cedc2ff198ca SHA-256: df77845c3a694e264a14d0f82fdf7df15d5f2beab244554d3c24b0c1a065999c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=genymotion+android+emulator+for+mac PDF link annotation
    • http://ivankotov.ru/img/lib/file/zonorufomurosogefetiperu.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/pidepirusukegobilavesogud.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/23164637333.pdfIn PDF document text
    • https://nevisnews.com/userfiles/nemabumumezezawegiwi.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/libebetibusan.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98c477974---kineb.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/23601347161302d3ba370b.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/furux.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/69020565970.pdfIn PDF document text
    • http://sushibelovo.ru/files/51845951322.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/gukenabitelewebu.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lilomiritosorakes.pdfIn PDF document text
    • https://aspirans.com/files/file/majoligowelasusel.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/kanejiwimatel.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210906233105.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/jamubukuzo.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/35555955930.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/jukasok.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/28744731987.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614352e0c9062---52888336734.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8e8f56efc3c7a16988abef1d05832319/tafisideguzaxomoxuwux.pdfIn PDF document text
    • https://kaisar168.com/contents/files/gagufotewuvakovita.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/xiraxuw.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/37844027785.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_off0000bc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC87 16344 bytes
SHA-256: 3ab0c343f96ec7af9832b328c698d197da508b556782721e83f87477c92f077d
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 10720 bytes
SHA-256: 7bc9253adc20a887ac24adc1c33739c1e14327d6d83a2040bae6ecfec4206969

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