Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7a08ed0734bb32…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 14:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67f973fd51afb94db9a7d21566803d7b SHA-1: f5057989cf8c298cf60ee8b9488a10621e2b91db SHA-256: fe7a08ed0734bb3294e0012a21c32b1c1e1d04c2a91798bdb15310f68e8e0cf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=roblox+apk+install PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c73acfb4---79246245308.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/lepivuv.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/10428915917.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/61068470314.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613988fe94352---mutonaluragevedul.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/26642878626.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7c9ad5560---namomazifozebepan.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/87013570904.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/5383816873.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xalagukaripetas.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/97755798126.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1bdd792c94eb303505d1cfe324341b1c/wiketugunop.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/67964548315.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/zupizajofetal.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/26613546460.pdfIn PDF document text
    • http://xprchemical.com/upload/files/15154971785.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/10912442174.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/fivateduzozowemaku.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5737183e278eb968064ec7ec302c9115/9217320647.pdfIn PDF document text
    • https://emenu.hu/editor_up/votepagife.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/47429293396.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/pubomarat.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_off0000b006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB006 10392 bytes
SHA-256: 0a62220dc851915712ce80e57be34ce096fa5a87d95ac95327f38b07f2893306
font_01_sfnt_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 15304 bytes
SHA-256: 1aa87352a30422c058fd40a1f19f8b539fe33c88562e0d4efc8f4e97262d9bd4
font_02_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1