Malicious PDF — malware analysis report

Static analysis result for SHA-256 4728e4fb66c3af6f…

MALICIOUS

PDF

100.3 KB Created: 2021-07-20 03:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5634ee41aa7f9fd51401562e2a42b01d SHA-1: 612bbdf352104a9c9975c98e695ac0588183a6f1 SHA-256: 4728e4fb66c3af6f0489bd6f95c6f0488e17813ea22d583b423d4b3e8c5e22f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

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 https://roweryelectra.pl/app/webroot/uploads/file/16264236142939.pdf In PDF document text
    • http://zae.me/datafiles/file/66900573248.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/67314092628.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/nuzajepifidopodagufib.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/efe71986a9f26c2b487bd40134840d90/jimakel.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9ad83bd164fd88e61284e1d8497c4630/tuzagonikirowitofesutufez.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/ligonu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050202355273499.pdfIn PDF document text
    • http://rubensova16.cz/files/file/tixamitosavubo.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1kj82u17p8nnc29qqt70lb7lmn/robid.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/k0apfktdi2g3u1ucemi5mvnbim/50503067141.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/pepes.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/8229ed4ab1015d0342eb6199338f3f8d/75334230244.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tmqti6n0chftkpiirs96tdlnb0/jogidubuwaraxepozedemufem.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c01e91906---46990946896.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/98662623127.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d81a9f7b9cad6039b524ff4446484c15/6556149139.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb76f3a3f---88551509298.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/87386207857.pdfIn PDF document text
    • http://swissfun.tv/var/www/porn4me.ch/web/ckfinder/userfiles/files/vexodetas.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e67f19f658---rarobojumekizazuvimufoji.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8288293a6---35508416275.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/94018357431.pdfIn PDF document text
    • http://hk-keber.de/images/file/59681617074.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/gidoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=another+word+for+self+fulfillmentPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010545.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10545 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 10624 bytes
SHA-256: c247702c4f646121752938d42b98a72a1cd45b291b70afa5130f731017506687
font_02_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 23288 bytes
SHA-256: cf5655ce2a8d0ef7a8f06a1dc24d856681984578d11f55eecb5b32338cf8f72e
font_04_sfnt_off00017508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17508 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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