Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3587ef531857bd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 15:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b4d37f2652e6a84432b7956e66c751b SHA-1: 64b0db7ed249cb1654e62ab079610be67a831f56 SHA-256: 9c3587ef531857bd62a91d38be3dab22c066aaec718e9b0ef1ee9ca88e706fca
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The 'Remote-support tool lure' heuristic indicates the document's content likely directs users to install or connect with such tools, a common tactic for social engineering attacks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pixomot.ru/uplcv?utm_term=copy+paste+android+tv PDF link annotation
    • http://sdds.be/userfiles/file/wojiporevizurimag.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/256b658b50cec01c12e850e356373e8f/niterapugarurodus.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/rexef.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/37737966300.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/39416098142.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/53330500974.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/35339732822.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161360b3713000---zaxixuxirowegolu.pdfIn PDF document text
    • https://hinaweb.com/upload/file/88336776309.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/jikobomisegomazesuvexigi.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/farokoxe.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/wukirukibimul.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/91435814556.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/19524202352.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/54358312428.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/nowotesuwifomelotizi.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210901220502759452nxork.pdfIn PDF document text
    • https://italvaping.com/file/13510777026.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/lelafi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161353ab65842e---ladomusewifudutomowub.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/monafunup.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/59222884499.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cc6287471b1915c67f1f58ea8f743f25/26955234042.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/luzen.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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 10548 bytes
SHA-256: 34ed9b44a97d91ddd726fcfd22cdadbd0ee209d4fe09f5f46a444278ac3a2f3b
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118D 17436 bytes
SHA-256: 73193e9dc2395df8518c68900e30c6ea25657709897ee06f33a3d6f49fa1974e

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