Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6834ce8acf2483b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 19:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b30f0837ec3d3f461964be585808707 SHA-1: f37772f0491faf376d7af450910462aa9409c3b1 SHA-256: b6834ce8acf2483bc625f6e804252eb00b2f5a0bf833d166d0b953982838e266
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing to multiple domains, some of which are associated with compromised CMS uploads or are disposable hosting. The presence of numerous PDF links and the 'SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to distribute malicious content or phish users through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://atenngo.com/admin/sites/site/documents/madikukazimekedujuwufi.pdf In PDF document text
    • http://bensonlandscape.com/editorData/file/turogejokijidowej.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2a2d6b171c106d0cafa7b3f72444dcdc/36655046888.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/53303454048.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074893b637e7---zutudobepusapitusaxareb.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/40618656383.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/99065681788.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fanefosogigudimuzuwek.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3e6131b8c---wawuranadojovokuvi.pdfIn PDF document text
    • http://dztechfin.com/upload/file///70891166399.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/rezusopat.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3d4e7c53---31269887411.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/bixegubiturapufoxaxelo.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ad731eccda3d8392aea0ce5e3013f92e/99639738328.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce37a048479---nutilixepubezimebumafox.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/18268180976.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/rupitobevekitujub.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/67939414602.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16102f0e79f7b3---jilasudunekiduvi.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/dejasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=traducir+pdf+gratis+en+lineaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 18036 bytes
SHA-256: f7d8e466ca8abebc6e010de9577c0831d26300c7a425c0a8881a09ac54ef94b9
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 10736 bytes
SHA-256: 9f4de0a50a90680f4f84f26253deae43448eeab34da9a2c677f4a85765c36b60

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