Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e994763a7be27b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 16:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6e28cd25cd3d2730ba306e2d281dc77 SHA-1: 46af8bad48db097d35b0bda1d0618799e07474a9 SHA-256: e8e994763a7be27b9aeff30369faae11dd76c1d69ec8b37009487d53029d3204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the compromised CMS upload link farm indicate a likely phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=wifi+hotspot+on+my+phone PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161308fe3bd94d---82999700891.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/doxenutubodukexeterowo.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/41649567455.pdfIn PDF document text
    • http://marketingnews.fr/images/file/govudeferavip.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/33813567794.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/87714398351.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144568860111---luwudibixi.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/zaxidudevomogujekamomafu.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/totinonewiremu.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/bupisivoposem.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090915150073499.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/fubesifugirifalulekogura.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/nuwefigu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161386bf5ddf6a---pefeloziponefakoju.pdfIn PDF document text
    • http://mq-water.net/upload/vimufuwozed.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/riwojaxumesiri.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6d7cbed5eb2d2d782c2a7b1368a90261/bovejezil.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/ravizurutaj.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/ruzivedarijodelikod.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/mipazokazaladokifaxap.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/j2d5qp6hhdo19t96la6fchu41b/40210609253.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/54843803235.pdfIn PDF document text
    • http://bamila.vn/luutru/files/31550642059.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/14593563819.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/74367316284.pdfIn PDF document text
    • http://szcftz.com/upload/buzogatudanuxazepotumofa.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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 10424 bytes
SHA-256: b3e13678bbd6f1f79cf3303f70052dee2e155b50cf49b8790ddeae74f0c182be
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 17392 bytes
SHA-256: c8337fa2733ddb241fe8652112d27046845cf80a1e9a7910c777a20ba7b2fbce

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