Malicious PDF — malware analysis report

Static analysis result for SHA-256 7473fc40df721b59…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 09:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04643c959554fa49bd13914cadb947bc SHA-1: 2fd8e656308ab6b5a866c79df1c0ba92c8fad669 SHA-256: 7473fc40df721b5916260d54f4dadd83528635c5e18438e8e0ce8324ddef62c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support the attack pattern of directing users to potentially harmful 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 http://maxidmum.com/images/upload/fck/file/razurumaresatidutikiwer.pdf In PDF document text
    • http://akkoryazilim.com/userfiles/file/pivisamugi.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/kedokuzotoviruzakozafo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/kuwolejazizipewasota.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19949e618---pidikaso.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/dapaxiwegijesum.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/lebukumikaruzipojiwur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b4455ff96---lenavapegajevokaxa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lobajibazififiku.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d7955f52a7fd3aeac209db9fc30e542c/53170296369.pdfIn PDF document text
    • http://wernitznigg.at/files/ludizuleviduletifadenuzol.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f79e696c898---jukivutiwodatadojununesej.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/96422509554.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210604_F146DE19D6297690.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/49343647357.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/ruwekomalawekewiwupof.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/75c9382e5498d5b0d99608650db99a6e/51160920788.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/fa7848fbe7a55156fcf47e67c1ce97d1/68603051748.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c7efec1f78d556a76a75b58c1e0cc330/niruxurujasem.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a6c2a6f5a---59745160817.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b2c6163b6---15546681170.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2945d0c7e7---13262423609.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160875932224ff---xujizino.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/bc1ba4fd30987c347bd65f908c4bcdf3/78858069622.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/bepezopinewuzudaliwubo.pdfIn PDF document text
    • https://genimmigration.com/viking1/uploads/files/duxuwufugotufox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=audiogram+examples+pdfPDF 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_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 17420 bytes
SHA-256: 6fae22280af7a86e555cf92acb890fbd7aaa647769c8f5daab3c3e86db393eb9
font_02_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 10820 bytes
SHA-256: 7033828d875bc98644b6963a690f193b2bbdcb565342d7617fcb7f0bc49eda87

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