Malicious PDF — malware analysis report

Static analysis result for SHA-256 9635c3d9e49d7335…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 20:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa2c30cdadb553b265dd7d460b7eb1a1 SHA-1: f5b197845d690ad953803081fc5059790d24e54d SHA-256: 9635c3d9e49d733516b86f9a87f2a80edfdc967f6f0c5d9ef9f196e21a3a78a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'utm_term=download+es+explorer+premium+apk' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=download+es+explorer+premium+apk PDF link annotation
    • http://dighakanchaninternational.com/FCKeditor/file/gizukunagumowotage.pdfIn PDF document text
    • http://hijoin.hu/editor_up/14678908256.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e265a4ec82---40526370215.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/42374371753.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/76525138191.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/wegesem.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631640738.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/19139381418.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/nisogaxu.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/32131218324.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132978e63944---40106812490.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/72698250613.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gurezosakegusijiweteg.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/88747220815.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/pusoxadezawomi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g1kq3vgcjsqdnp259tmcfhl1d3/ragofure.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dfc9facc---legolijevofipas.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/wezidebawujabila.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/fuwazufi.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/15921380096.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/poxadinekazifo.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/folisesitigetujum.pdfIn PDF document text
    • https://thehouseproduction.net/file/10110228127.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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 18936 bytes
SHA-256: c2a9f57775c068b86a8f3e5e4faa71945a5e62bced5bf7ef07f462736b01654b
font_02_sfnt_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 10836 bytes
SHA-256: 596a8b63356eec2d481f74f6e4e0e400e5014171d9829392e1dfb80183a09301

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