Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbd1176b0bea911…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 00:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7dc28d158ba1ab7e020fc4bf18fa74bd SHA-1: cfdf4bb32c76984e4e37daf9816ac168cb9afd22 SHA-256: fcbd1176b0bea91142a3f03edb685d0e6569de87ee0b2894b70111ba56b06c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the structure of the document suggest it is part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=super+battery+saver PDF link annotation
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/jfkjqahhjpiigimku9t5t0c5uc/jobuxobifejojugaririve.pdfIn PDF document text
    • https://successalpha.team/upload/files/lamikotufinapokewuz.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e637a329---15791173260.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8aa30d60---12668448282.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/sqgevi96uihl7rn7h1sa2ou8n2/litarikopapasevuzakedot.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/denapavenesegip.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/vuledumiwemedapebafepa.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/46790407305.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/sitokabakuluza.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/napogadavokajesokut.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ejdov3d9e8vqn92n3b205v7q3s/tomawifi.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///jubofixomesofusatasek.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210917_9A43EAF00AFC90A9.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210906_598C0439C3B58A1A.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/92246497638.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/mowixofuxom.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/farefedipodadimi.pdfIn PDF document text
    • http://packturf.fr/files/96319843385.pdfIn PDF document text
    • http://mayjack.com/upload/files/72644630980.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7c71ef0ecb5e62825c421b8f50d50822/vigowojunuso.pdfIn PDF document text
    • https://asiapharma.la/files/files/jilitidopusijuju.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f314668c3d05775496ce90ec6d14deea/detubobunurajezazuxigadu.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/natigovof.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/bigowenilebiribox.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/049siofs4p6j3gpdpefh0nmh65/galujaku.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da3760e33---jiperivusisutixovosibamo.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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 10376 bytes
SHA-256: b6b6d9269367f5add00daca6b5264ea3e2c3e7d25959b91940306cbc28cccf57
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 17576 bytes
SHA-256: ee1ea6eb82456771942c1bd119e6a3b5f8f50e85ed45360a23174cdd7419144c

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