Malicious PDF — malware analysis report

Static analysis result for SHA-256 004427cc42ae5b0a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 14:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c51798838a7a4b3294b76c178842cf60 SHA-1: afa7c257e9a707d2fd5c3f9bdb1bbe5bfcd04aaa SHA-256: 004427cc42ae5b0ab787bc81f9bc596c68b6c9f242e8e8303dbc7bc8736b861c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kyochonbuenapark.iorderfoods.com/uploads/files/80046054688.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/043h9bnjae4kh333tgj4n1j9v2/3838185876.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/75559833994.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa116bd94---sojubewabagutamukim.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/af18dc58d8c95fed8c5ac6ad4b7540bd/boxane.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/pamer.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ca3d7af95---wuwolugabuzinarisinotor.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/biridovuzenubut.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/nasokobemozizulideged.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef8cd42725---tulok.pdfIn PDF document text
    • http://boki.hu/editor_up/bobuvojawidexemes.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/ganivarotitozok.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e58427c24---41243267.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/68511313586.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613291b9e1a0a---sununufesowogexu.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/13762973442.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/2497501608.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/dasipagemabul.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/tolodenod.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/xoxogakewamavodipano.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/paxisiz.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/vubadelefugel.pdfIn PDF document text
    • http://apex-architect.ru/images/file/gosulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=toefl+itp+practice+tests+volume+1+free+downloadPDF 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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 19768 bytes
SHA-256: 793f6e372c790d1403577ab3adae6ee720610af64841214ee766a2a0ddf3bac1
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 11048 bytes
SHA-256: 6c3407f23fe403619316ffca494f8658b1c5ca54d702b1e4c1ccc37963e9df34
font_02_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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