Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf1493a75e50465…

MALICIOUS

PDF

69.0 KB Created: 2021-09-18 21:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b948fa455bbaf7124a5bee1b4e93e69 SHA-1: 4f510b61d3775b89ab3c705efe340ace0405f720 SHA-256: baf1493a75e504650afe4cdb8668ce6defb8ddba39641580d785cd2d8039ffe7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader. The link farm structure, combined with the ClamAV detection as 'Pdf.Phishing.Trojan', indicates a high likelihood of this document being used to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://speckrepeg.by/UserFiles/files/wipadopejubigilowow.pdf In PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/98189309758.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/rumupaveguxivifomaxe.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5225da2a4f44f4f5e0cc1b3a58a18366/80220001328.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838cf04d4c---rikegonenonibozuzeg.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437cfd1ff83---mejusorel.pdfIn PDF document text
    • http://napiarsaigh.com/images/60195108706.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/sadifizedukuselenuf.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zoxoposokewiv.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/22168966011.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/kerejimaduk.pdfIn PDF document text
    • http://melvin.cz/data/17422486184.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/80374095103.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/f435e16db7321ec5bd57bf7e4b247d87/35855213319.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/30202116263.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/pukirudobod.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/51785969408.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/kanutepisovorolufulomadev.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/rivikabarubomopivirifapir.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/jilobokivixurososif.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/25138029838.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/rewadiped.pdfIn PDF document text
    • https://bolahijau.com/contents/files/peziwedezuvux.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/vuxasuzuwibikawefiwesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=little+nightmares+2+android+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_off0000b143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB143 10860 bytes
SHA-256: 352a01c7c71ac7fc6b0942ad1ce75b48db56eb7c14daeecd5334753f509c363f
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 14440 bytes
SHA-256: 507891a618094c6b9b813d35079910559ddd9992e7877404bbdd3d928332a03d

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