Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f1963b42ab469f…

MALICIOUS

PDF

71.3 KB Created: 2021-08-31 22:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44e57efb332c312206f7a00b59457400 SHA-1: 5c1f94a78083305c3e0f9b16606bcae3f2e589e6 SHA-256: 28f1963b42ab469fd298b63364723dafd2abd04dd1b83f2dfcd719d5f6d4b627
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4aba1f81674fe3019bd5361aea25e173/nojufenax.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5f5g3tpv3vu119nua0d8lcuu55/vuvegeto.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/gawanuvazagalodarotelor.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/sinuj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6910ddfb4---7534004874.pdfIn PDF document text
    • https://triosms.com/userfiles/file/84411716864.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/27404538046.pdfIn PDF document text
    • https://mackbeks.com/files/file/rowakelil.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/71639697880.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079162d4265a---57906876641.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f5db5ad7---japosimamosuratatilize.pdfIn PDF document text
    • http://nensi.si/upload/file/nuwixizunaxebotufararemu.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/wujofap.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/samudeledupigudaxagopor.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/pojumofiduxomuwakuwen.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/pirovazokufapu.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/pekosoma.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/27274808681.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/taxebuloko.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56206909101.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c520eede5---melukadowiduvudex.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/78124538871.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/69471626148.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/56762428570.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fimofonuserogipiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vails+dry+cleaningPDF 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_off0000baae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAE 10412 bytes
SHA-256: be977ae557f31204d9c421546aebda397c2416dc5e5b4de523ac97d6e7b29164
font_01_sfnt_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 15176 bytes
SHA-256: 40d49ecf9b44c0b120a3250c9d56ec61f4a6b059bad724e8098c996095b70c00

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