Malicious PDF — malware analysis report

Static analysis result for SHA-256 4285e2972d4c6915…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 09:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae779d1663b045139d9a99cefaca09cc SHA-1: 37a7609526545200f62bbfcb0a55932714c05f29 SHA-256: 4285e2972d4c6915e4a4718e3b7f0f6fa1baeaa2959fb4fabfffc58464af6b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://zwickerfoto.hu/_user/file/wotelupezigezizeze.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b52001b4---vofadavubejedirilategofo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfda8bdd558---zikugitedapagoxupetu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/9db5d795cf2c1e59ea483e1a78aee329/dirukez.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/25010726993.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/23818144096.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/semaruwiditutokabuveb.pdfIn PDF document text
    • https://fasleh.net/Files/files/wanuli.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/97573833036.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/vodumubasulupinisodukaze.pdfIn PDF document text
    • https://majubesar.info/contents//files/69164946310.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/6jh7jrelft8acr6jfbkbi54upe/revir.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3bc18a67---48121482686.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/fowidebumifolevomagipum.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zabadelafarubajegijig.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2781a066---jedusurorof.pdfIn PDF document text
    • https://uangraja.com/contents//files/42595762095.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/tifur.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///82947028541.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/92923259283.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/24542361886.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/28173778409.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/lagojobununafikubokin.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/xixodepojogokipewufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=geometry+area+of+polygons+worksheet+answersPDF 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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 11044 bytes
SHA-256: 7bdb2b739081865c5bfebff79d5686478abc44f6c9961229d3d453cb76015b80
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 19220 bytes
SHA-256: f0b3a362e4ffd80b95980a8882ba345bb63e3961868c325e84f7d39d02dd2b5a

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