Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6a47e2d45c096e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 06:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0bfc11fb20131600d3bfa77cb7df877c SHA-1: 63c737585051e3e4d11aa5b780a99138b7a467d0 SHA-256: ae6a47e2d45c096efeefef41a42614ffcbcfbf26fba3c728a73c07a0973da3b6
164 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The presence of a 'download button' heuristic, combined with the ML classifier and ClamAV detection, strongly suggests this document is designed to trick users into downloading a malicious payload. The URLs point to various PDF files, indicating a potential multi-stage download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+get+downloader+on+android+phone PDF link annotation
    • https://studybrilliant.online/app/webroot/img/userfiles/file/18579526795.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/kezelutumatepe.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/malometajovigod.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/13498523188.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/26249421600.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/945e78ac2345c297a71e38ebc9e2f1b5/79236636221.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/resufewematar.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/vukubugusurojerifuvi.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/tevufavovovuxif.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613910cfa723f---moxugilupizub.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/75477252152.pdfIn PDF document text
    • http://clickvay.com/upload/files/kukeraxawopobosolidurus.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/51273032252.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a41e36a6---29168164289.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_073035.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/sazumajuvilusimajuseke.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/mimivixodozavovidor.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/60232480608.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wamedidevi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/sezaxiv.pdfIn PDF document text
    • http://ministerium.pt/files/jefexi.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/12936001004.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/4908554295.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/xufurugabamudulopokikig.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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 17732 bytes
SHA-256: 7a32ef5ffc81b62d06b4470c91a5629f48229e933e3d223198d953c56b89876d
font_01_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 10580 bytes
SHA-256: 25157e77ba5215c998f751b7317b59bf57015ecb9ad6336ae0e50fd0990b3ce3
font_02_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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