Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6c8df04cd6c170…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 10:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41b8cb61e15e0d5d32dc78b81addaadd SHA-1: 2dcff3cf40f55328749bd4655cea58b6d847e6de SHA-256: 8f6c8df04cd6c17092f836cf0418b4a2437190483cd12bab3ec3ab7b900f467d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://chcial.ru/uplcv?utm_term=onn+tablet+black+screen PDF link annotation
    • https://tlkingatlan.hu/kepek/other/file/bemexomanaduxafewoti.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c89379a7f---wisifuxepojelujik.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/39851850583.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/gejoxel.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/42076649182.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/zetowomegazuwid.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/25775885116.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677f8ca106---76575570702.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/mofenugigodixowiget.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/wagajavixi.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/wexopejaduzowa.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/97690764303.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/tufulonizekupo.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/dopiwelamu.pdfIn PDF document text
    • http://flirdining.com/uploads/files/jusesodumatikukebu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0570b2fb6---kuvemibolojudubikixi.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/mejidilajijafokukalotuwif.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/welojifozidogam.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/femanoratunajosotifitod.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/90820707231.pdfIn PDF document text
    • http://jfe.hk/userfiles/xorakibepibotebelijaxolab.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa704ee44---zobara.pdfIn PDF document text
    • http://www.celso.org/download/vixonipes.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/wuvomoselokekovifaru.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 17068 bytes
SHA-256: c349cfa09f4a630659d685dd81fcf80cdf223716051119232c2af3ff05f4297c
font_01_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 10268 bytes
SHA-256: a77fa98b92d83b121209fe735373cdd6faa790aba0244fc3dda8f9c601a7344d
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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