Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f21cc7e7a3f36b…

MALICIOUS

PDF

73.9 KB Created: 2021-10-22 20:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1fd14eef06bceb73d1b48cd884648690 SHA-1: d52e9e3fad540fe1952da2a019b0a719e4ccd37d SHA-256: 25f21cc7e7a3f36bbb0a6089425bb26481d1d52c2a2413a352224052826dd7c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be leveraging these links for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cyklo-wellness-penzion-palice.cz/content/47417357123.pdf In PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/webijewelanafab.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad9d3aee3---28709373266.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/9708112839.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/14088924650.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/simogiroxi.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/kigewubidigejilasakod.pdfIn PDF document text
    • http://grupophi.es/uploads/files/3778993027.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/litowalopiko.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/39026047617.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1616e326ed7cc2---zizebod.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/13837994832.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/joderezowajobekoxirivak.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d7e8e7dc---42352819461.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161610c9f1d4ba---tajefisaluduxixodiso.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/guzeburoxis.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/gujilerubalofugejikobeb.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/jezevujuza.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/71750074266.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/mowugone.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/netutijobim.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=meaning+of+speed+upPDF 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_off0000b810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB810 19668 bytes
SHA-256: 7f50d46774b8039d5e7896d1503264f198302f863f332c27f03975c9292c4a77
font_01_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10524 bytes
SHA-256: 9ad100f04b8e034d1f842f4dcb7516f1cba9351767d78af0aaeeed97ea7bb9e0
font_02_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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