Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f0aec4f2211247…

MALICIOUS

PDF

69.7 KB Created: 2021-09-18 14:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa22c6ef9689aee1f1942835b682ca4c SHA-1: deb87e0537a071a1250f7ca005dffb4ec2c5f71b SHA-256: d0f0aec4f2211247c02733496215638035ab508a2f124ac895cdf1899595dfe1
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=how+to+find+wifi+password+on+android+no+root PDF link annotation
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/japoveremiburivelurosevim.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/hjhkpcjcdhja07ihkf17g7bk91/gopukinekedujuxebegixabi.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/53522351218.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/35920504415.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/vokederitol.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/16094787722.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/54173570348.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210909_FD64FE094ACE87F1.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/63627117734.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/nutumaritaguguv.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/89215243899.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210912_194624.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/470958c6ea73b900f31a732e37b565b1/fikapuzalunusu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fofisewejetag.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/52240481075.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/51340893065.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091805112629776.pdfIn PDF document text
    • https://southafricapools.com/contents/files/jifidinawuwaxujukidosu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161367d9575432---juwosedekelurefemujoxarok.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/viluvonat.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/juxexelupixapo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d3031cf6---15300927840.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/basunuzeka.pdfIn PDF document text
    • https://trystsalonri.com/images/file/54937040029.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xisesobobenowajipatame.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_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 14948 bytes
SHA-256: 1ccd35c2bbd7a77fe78c0350fa4954a04cedde9ca965ee634bb23aee65da97a9
font_01_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 10392 bytes
SHA-256: 595c791770deb4ada16cc273d19cab3027a8280050ac4b957bc15547e347ed07
font_02_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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