Malicious PDF — malware analysis report

Static analysis result for SHA-256 75435fecf17b9d0b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 04:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1bddf8c857d83b6a1894fc9797c751ad SHA-1: f8172330d06d85a03643b87feff3960186f626f2 SHA-256: 75435fecf17b9d0b48ba209d2022a544f717a54cdd12a31f5d564113ad27f06b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://metrosecuritynepal.com/assets/userfiles/files/narupotuvama.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6f94f65c9db62d8e4310d8deafd32f46/wevusup.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a85cb199---48489708736.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/58059316606.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210902100819.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/ruxotuv.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/pukapabosomisegades.pdfIn PDF document text
    • http://www.puhito.hu/uploads/noveboburesupazarofe.pdfIn PDF document text
    • http://topflexsports.com/uploads/temujebexijumafosef.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/popifupekugirifu.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/pagofe.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/boratizokiderizepusigaxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312cba1811f---627064717.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/pibawuzevuzuzaxalakoluki.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/1353712123.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50ef1de99---79592415981.pdfIn PDF document text
    • http://rsst77.ru/upload/files/jenaxa.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/zeviwusavenijuvaw.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e9b81a817247f7f7268136384cb30e9e/falip.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/wafixab.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/86436235662.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/29632797946.pdfIn PDF document text
    • https://parkettworld.com/upload/files/47538961560.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/27804640078.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/suxopirawudinagojolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=4th+standard+maths+book+pdf+free+downloadPDF 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_off0000c5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 10968 bytes
SHA-256: 735754ac52e5c860a85eb76819de060a9fc1e19469fb2f20ea879f33e7cfd28b
font_02_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 17436 bytes
SHA-256: c5fe67297500df9c32fcd1f4bcd13c29bc61dd01e23d70d885fbf9155ee92d01

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