Malicious PDF — malware analysis report

Static analysis result for SHA-256 d833cde804f4dd6a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 04:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9bae1a3e1de0987ba121371aad26ffcc SHA-1: a6c5a559f03409443ae2aa81d8c8956a5061376c SHA-256: d833cde804f4dd6aee8d1afe62fd6a62182e9bee560b4d8c52b846218051036a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=paf+le+chien+rugby+android PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132516875f05---xosomamorebi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa8deb748e---rufoxanekafudeketebu.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/kigebipegazijezexamolitip.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/dativogojejinazitefuke.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354decb295f---37568959214.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/nufosaxobazubuvitin.pdfIn PDF document text
    • http://redactron.com/userfiles/file/duvunokidogakolasegage.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/27656904360.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/9427603111.pdfIn PDF document text
    • https://apra.pl/files/file/68358632057.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/466810873.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630718691.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e3575e52---lemogeperulin.pdfIn PDF document text
    • https://renetravel.ro/images/files/65812309107.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/raguvexevewasadepetopiw.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2f7ef2beed7dcecfb54fe55b6b65af0b/708707170.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c828a59935---44205023240.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/67317415664.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc59fe2073---98866004049.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/nabafovudusarobuzexapi.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/gubowufunamol.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/kevasirajotuvisajema.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/23786881116.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_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 20476 bytes
SHA-256: 81355c7846265acf6d5e6ee3b59794a91cae6379ab8c512495e40ffe18e2b2bc
font_01_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 10844 bytes
SHA-256: 94beba886ab2ab1d32ddba4314da6f22cee659080bdca108d3d7632aa1399f85
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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