Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9d962d26fb86a0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 22:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8944f8bd854b729f75d0964436236540 SHA-1: 1222060824786550fd179b34c7136c1a0aa7af7c SHA-256: bf9d962d26fb86a069f6aae4c62eb52b53ec1b92170fddede433822b5bedd365
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also includes numerous links to external PDF files hosted on compromised websites, suggesting a link farm or phishing attempt to redirect users to malicious content. The presence of embedded JavaScript and external links indicates an attempt to download and execute further payloads or trick users into revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://felixefontesadvogados.com.br/ckfinder/userfiles/files/57046214022.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5547e2ac---18834011110.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906080653980.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163117d0d0---71382265004.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/82920155590.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/lejirepetemew.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/52242320795.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/mabefokowiraliwimomuda.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/74960157433.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/76504094404.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/sivosagopazel.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9f59e4596c6cc294e3ff0613e6f5be30/68319300474.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/96775378299.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/77040387338.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390916d9cf7---wavugu.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/ragunebotegimigosepowi.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/1259435953.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bf23d586f9371b79d72ae9438220556b/27596013476.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/mugenulodemadilirarokasa.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/xojikatidupuvoxakos.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/basodagevekoxixe.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4c98c4cd---73525791653.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/48732018901.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/wuferoge.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/pogesoxikekojovesaxogejon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=subway+surfers+free+download+for+windows+7PDF 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_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 17176 bytes
SHA-256: 45d0ee74ee184bdbba459a60f56b51e9f69531859cd991a89725d0977d5e4720
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 10816 bytes
SHA-256: 4b7937ab4aea9ca681f009ec4ea9f8898bd59cf10d63e84cd984d2c827850c9b
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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