Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc3e8140cf15c67…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 22:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3df43e0ecee56126d6a9882f2321832 SHA-1: 88780355b41606a789b5f3a8e28706b5fdde0c39 SHA-256: 3bc3e8140cf15c6720b9161d1e300e078ea4a34d76377d34ae93beef26b5252e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=the+kissing+booth+online+with+subtitles PDF link annotation
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/40879172749.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/zugorewuxudim.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5rgr2454mbvpu9mblfjjpdhefb/75173612120.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/78587569345.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613611991a1e5---40517231955.pdfIn PDF document text
    • https://successalpha.team/upload/files/35628016734.pdfIn PDF document text
    • https://o-dance.com/upload/files/3850669466.pdfIn PDF document text
    • https://hsse.cl/files/78464454952.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/15354533794.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/bonazaze.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/bususijorobulidovaf.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/limalipezadukodejeloxu.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/35830844111.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/zudopotes.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/zozazexazuresemetanurifi.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/16806528091.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///konoxuba.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/82264132929.pdfIn PDF document text
    • http://amandamaitland.com/images/file/79522374206.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/36392491192.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/16176317189.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/gelomelusubuzunegowole.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427bf5853bc---rugisodelapexigu.pdfIn PDF document text
    • 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_off0000ba37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA37 10508 bytes
SHA-256: 147bedb0c0c1f938ccb19ef7047085f3d93ec226eafa01a836624c03d6817ad5
font_01_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 21408 bytes
SHA-256: 83848b5961212829e4d6f12bbdb7ab9aa21b13733cb4dc5cd5a5e9b484805419
font_02_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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