Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef935e633f505ec2…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 20:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 263a2521c0eb306d25b31ec7d6ceaf72 SHA-1: 318f7ff03bc2b56e766eeaf2fe65e370764c0d3e SHA-256: ef935e633f505ec24fe2464ee1fc26fb484a6942122264d9670b493ffb174199
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host or distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the final destination. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/4daa2f966d42f5334e4918f250898fec/niwoseputojujunejofu.pdf In PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/dc76qibb0tv83304ui9v4jf908/25553585333.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/povonulip.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ibhajo7bsud3o1qbv6j229khb4/vebunalib.pdfIn PDF document text
    • http://falerisztika.hu/tmp/93067424644.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c215415bbae---denejadamawe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089359f30a0a---dufitunom.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606da160da15a---73045194000.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/jeruradimaw.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/verezedatunava.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/40778327244.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/77261103777.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/53453980762.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6vbs42pdfjfokiql1ipkpi6if6/kodoxevi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3da4d8c7---fobipe.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/28704619421.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/vikitasegujod.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/56382601067.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/18539297016.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86c82166a---32780299115.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/xofamuruboxuw.pdfIn PDF document text
    • http://yuha.be/_files/file/sowidowad.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f676cc7e0f2---38483846392.pdfIn PDF document text
    • http://sjhtractor.com/d/files/92948676370.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a68563236---25649340034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=carl+rogers+theory+of+counsellingPDF 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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 10860 bytes
SHA-256: b76eae522888c287aba0f97ea01830d731166d84d32e6d6da19d39492faf9838
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 18100 bytes
SHA-256: 3dd77d8a75e8cedd454bbb366f61614cb234a41117940c2ab43b54e034090ecc

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