Malicious PDF — malware analysis report

Static analysis result for SHA-256 9357be84a6492cca…

MALICIOUS

PDF

87.6 KB Created: 2021-09-20 19:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8c82f0efe2975670f58c39da4f21fe2 SHA-1: 96c3465e99ffe3cf9cdace736beb2ea72c9efcd9 SHA-256: 9357be84a6492cca28ef22ff74979c80340353d6e0325754943612dfb12f3df4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the structure and embedded URLs suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://knipia.com/userfiles/file/67252739923.pdf In PDF document text
    • http://shop-exclusive.cz/userfiles/file/famirula.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/94016703942.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/54669383569.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a59d94c7d27bab042fa72b6888e98a5a/zewuxupifimisat.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/lugofotikebu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16147c3ed08a76---kuwudurimumonurofewu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161370de3ef2cb---kovejoxefilivadatofir.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145f93ea624b---48323961332.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/vofajulivokigupusur.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146de5b3124c---85052048714.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/58959592499.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ade27e2b7e6f79f067ac77503d550ec1/60882367824.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/kememegutudevibekos.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/mugotanepozewaxijuta.pdfIn PDF document text
    • http://www.heksan.com.pl/file/doxewumokave.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/958105666.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/futisawoxuwunago.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/pagabipemiloruvafexudeg.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/lisonuzulofifo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6700ac407---razuta.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/70344876794.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/56227569971.pdfIn PDF document text
    • http://zuszdounky.cz/files/xobuluwugokogigisape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=save+game+progress+androidPDF 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_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 17172 bytes
SHA-256: ea8859958416aba74efd5f171013f7209546d75ea31266535cae943caffb87a0
font_01_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 10732 bytes
SHA-256: 171b7ec9fe1181c5997c097e682b421e34ce654de4bdd8138c8f2837fb8ff86e
font_02_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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