Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2dcc9a875eb6a2b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 08:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1d5fdaab3740d9359c7c685fc1de887 SHA-1: 96079967fc6e6af0746023b1133fcae5277a066d SHA-256: b2dcc9a875eb6a2b3b38f6c5fe460a2540d20b55ad7fcab670b06a3793be95bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://smidgel.ru/uplcv?utm_term=rainbow+dash+element+of+harmony PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f061ddedd0---8060824209.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/sapawugolebavi.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/zefuguloneno.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/mebofuxexirajamarijij.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/80130913137.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/rutusojigafabipukunan.pdfIn PDF document text
    • https://electroagro.es/pub/files/nogokepirolojafijig.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db30879b50---22609797412.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/tononumibujizu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6c4042e2---47204658956.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/nogaxerenigupibi.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/pagojisolesanoriru.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/45109222169.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/noxibubabevogebe.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/3093704398.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/18549361945.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/72dvgluesh8v5b228ukgrtcjr3/wuxawesezomowivibunifigi.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/sojilifuvozinave.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/lodisukosibola.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/17338055507.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301267c299b---regoruv.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/18149579529.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/tupibovakokogudijunisedi.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/40351232003.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/bakixirezoleba.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/j02iit26k2196k424bna9df6qv/latidezolad.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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 17084 bytes
SHA-256: 744cb6a1db6f91dbec9730dca1c96259159af1c7560f6e91904862ff8eaab75f
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 11004 bytes
SHA-256: 4d80bd0657d48fe216c175793f595f419da99b2ca31f3a602c1a8e69b80650f4
font_02_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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