Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cb0d4b37d8c2b3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 12:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d5b4b0fde1dad8895b486f7b7272c3d SHA-1: f71342a591fc97d2a172f5a0ce4c0a9695244466 SHA-256: 92cb0d4b37d8c2b3e7f68fc3973bd2210cc6c37bafa7a8ab70481603ea779582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://ayurvedicclinic.org/userfiles/file/98220562831.pdf In PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/gekowetafafejibo.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/pifafepisorodamaxepa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2908aac268c66c8bdd2262d00ea8590/20205700252.pdfIn PDF document text
    • http://rcmo.ru/upload/files/87869056856.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/52681617337.pdfIn PDF document text
    • http://saaretravel.ee/images/file/48227699740.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vupewuwe.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/95953469546.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/49635273303.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/15843054869.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/67990627881.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161390644ed2f1---63075025076.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/kakajov.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/lubaxofimi.pdfIn PDF document text
    • http://checopharma.com/upload/files/84531647933.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/79009569712.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/xawumaxinezozumokipaveso.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/dufinodilugemuduge.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/10807322400.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/85709117995.pdfIn PDF document text
    • http://getem.eu/files/file/sovuvagup.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7dcc62971---rafepaxune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=design+home+unlimited+moneyPDF 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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 17720 bytes
SHA-256: 8d58b2a3388918b5590b4d8d059d550bbfbf93e6e440150e41b50e8496732e24
font_01_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 10648 bytes
SHA-256: 236f73c6fd9c3e8c38dd33daedebf191a20b0d673b8aef9f62c0f16b0aef1346
font_02_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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