Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4240c3e7ff608fe…

MALICIOUS

PDF

88.1 KB Created: 2021-09-22 15:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf2cd8988c4f2fb146ab6e0f2551d47b SHA-1: 6f1cf509ee2218d978cd280999377076dabfe12d SHA-256: e4240c3e7ff608febe552b1189cae38b90664b2194b587db5aff83c4f2a384c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=latest+lulubox+2021 PDF link annotation
    • http://www.valaisconsulting.ch/file/kejevijazixipi.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/70731782118.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/wanobosome.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/32328990549.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/jajime.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/72702366322.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/d4216h1as3qb57gbrjc0vais5h/zigafodusajirisedi.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/57400590249.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/gapobalikizixuk.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/33840157598.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614808675621e---67600644488.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nesebij.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489eee56af0---47841869567.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/roxazerukodubikovejabij.pdfIn PDF document text
    • http://vecsecity.info/editor_up/motaka.pdfIn PDF document text
    • https://adci.vn/data/upload/file/82862523795.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/46688341113.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/xelodarorobetewowoson.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/612fce731b372.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/burixedumep.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/jiwilegamujunu.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/sixofidojuxowenefegew.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_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 18780 bytes
SHA-256: f243f6fa16dc253a83d76fb9207b185995eff5756620f0bb9f4f8eef2148cae8
font_01_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 10396 bytes
SHA-256: 0a98493d9c48f648003f5664f63bcdcacacc8ed030158ee25036e85dcbca2af1
font_02_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1