Malicious PDF — malware analysis report

Static analysis result for SHA-256 350e4241c3327478…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 10:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 058c9ae70ae7a6e16d74cefc55040f4d SHA-1: 088da16e5e544b13b89a5ac17429fb26f1c593f0 SHA-256: 350e4241c3327478055999f925444e95e6640ac1f147c42c7cdf5da3c5acd78d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://1night2day.com/ckupload/files/nosabagilamure.pdf In PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/gobupegijiwezedew.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/niteda.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/jisiroluperopasa.pdfIn PDF document text
    • http://intertravel.hu/_user/file/47862231774.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/55389699863.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/xowepuwuboridolebanafob.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/3549298469.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/33050558504.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/28625409979.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210916193703.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/pumuninekuxugemulu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9a0902f---nixivixusugem.pdfIn PDF document text
    • http://standardamulet.com/files/files/vosavari.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/94443367901.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c48706b3c9ef62a4b90fbfa58a93848b/nuvotakudifibage.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///16074158222.pdfIn PDF document text
    • http://kechengchem.com/upload/files/44585554363.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/xutewarovenug.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315e43da162---nolivewetimisepiv.pdfIn PDF document text
    • https://lasanisports.com/files/venodoxumara.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/iaduekmaolvsgtceqn2h18uge6/71306241239.pdfIn PDF document text
    • https://maviet.vn/upload/files/50943158653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=words+that+start+with+n+and+end+with+gPDF 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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 16396 bytes
SHA-256: 7a9a2dd6e107983d10ec21cd7f0f91d3e090e013f70b62e1b8871a3baadf54c8
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 10560 bytes
SHA-256: dbf3b4e67c24a999a163af871ae4f36b4c330b63a10c15138c73dedf03b4cabd
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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