Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10302a2bee1b0f4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 10:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcf69d0099d6a8896f531dd50745187b SHA-1: 4bffb3ea11cb12420cba690fd1344ed14f81b832 SHA-256: e10302a2bee1b0f431b223e0ed1dd4c9715517e379fd41107fbbe3d630e6133e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to multiple PDF files hosted on various domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for phishing or further payload delivery. The link farm structure, with many distinct hosts, is characteristic of phishing campaigns aiming to distribute malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ck8pqel2ne1o9h2t91qn37je4e/21984932387.pdf In PDF document text
    • http://winso.tw/userfiles/file/kupar.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/56045741778.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/61860552546.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/9srgf2akku5hi69kvkimhhkepo/67195024214.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lotemiguxipuruluzuzabala.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2e971d030---dewuluvuw.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u9feev8qitdnkeanjkkm7p3853/zitategelapimenokiwelene.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/levowavekuxubozanula.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e18719b---sibivadusuroma.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/vunopofanobipe.pdfIn PDF document text
    • https://designclarf.it/file/vasalexekanuleduzojidafuk.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef60e9f219---53357107791.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/woruwitilaxuvejabizosalus.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/68498016321.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742f58ec77---3747508592.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0de8f5f8e148f5d92641dd527324c599/fotugabeb.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/49889783866.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bfb0200e---84997864528.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/2363893619.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/xudap.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/retaxomuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=doctor+faustus+text+pdf+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_off0000be92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 16672 bytes
SHA-256: 09fd87ba40edb9e64b4cc16724fd5c3db94f3ddfa94c4e2d102b0bb12255bbd1
font_02_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 10812 bytes
SHA-256: b6708e4360badac84c57da19c5307a23dc587f46122acfda307dd23e625b5a29

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