Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba111c5c9462744b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 13:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac0f287e64afcd57cbbd4cd2716ae063 SHA-1: 89860cb789d06ea5f525779ecba81bea101d974a SHA-256: ba111c5c9462744b856191b2d7aa40524149e9e1f8f368e494512ec7640d4e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=fingerprint+sensor+app+lock+download PDF link annotation
    • http://noahmission.org/dataroom/file/40661777524.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/561902676.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/lekubatavupujolinokoxasir.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2ebfe2622---zisojapexo.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/65027534121.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/jonaxixivizepedomumam.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/pimizuvafibixuluwu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/jitukogosedov.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/tivedafawajuwoz.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/zoresopin.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/gudetuvobu.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/16304169824.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/2905269233.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/26038795179.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gqgvk7mn4b88i93hggsaioku45/18952695024.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/52888284281.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/jakaribeganakuwuwibuv.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/rerim.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/41647971163.pdfIn PDF document text
    • http://ubest.ru/images/file/funigapexu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8a464bfe783d2622352ea8af3a4b9f9b/34065469779.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210919_105427.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/29246523854.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/50463365047.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137197d4a6c5---filuwaxeferele.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/tejabo.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_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 17056 bytes
SHA-256: dace0d75020733fe8bf3fcae6687336366070fe9f60327f92af47760134f8cc9
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 10844 bytes
SHA-256: 52ca7f7514c5cf3d2d72e348e571b231e0378e133cf01b9822ef040f9153a770
font_02_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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