Malicious PDF — malware analysis report

Static analysis result for SHA-256 68358cf373c8ce28…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 20:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc2218a5aa535b715fe709696c08a055 SHA-1: 95d8ce88850284e7a062ac74060f930c87952944 SHA-256: 68358cf373c8ce285aad94b9aa0da2b363b306714b5b73b96c53b12110cfa38a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=dead+target+hack+mod+apk+download+android+1 PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5344de785c8c42a8e19feb5eac066f93/24334785773.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/sajedawuduvegetunijegumal.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/30679227043.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d39566df1a---mesipusimig.pdfIn PDF document text
    • http://cudicio.it/images/file/lukadexumojubu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfccea828---35857100133.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/japadirujixixifo.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/xidas.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/suzizodizokekoxureda.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_133140.pdfIn PDF document text
    • http://sbairs.com/datas/files/77630261259.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/dulisebesapuwagorovomuw.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/76514064702.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/mifuzukorokidosekotejipi.pdfIn PDF document text
    • http://15881588.com/ckupload/files/87927276097.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/52435702227.pdfIn PDF document text
    • https://priscar.com/documents/files/60334603742.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614524b0bc07d---vemenawapujenak.pdfIn PDF document text
    • https://31app.com/userfiles/file/baredabube.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/36060097196.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/10133089360.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/nufevijusojoz.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/zasubex.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/72577697592.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_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 11024 bytes
SHA-256: a44912a611a23cfef226b69561b9ab2d8c54f5df06505c011c33eae26f2269ca
font_01_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 17248 bytes
SHA-256: 62aa6537fb56e41699c705a102c950f18bf73d1f02eb332b5d3c33b1aaf6bc53
font_02_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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