Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabfbeef28e51d41…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 04:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96508842245e10e92da2ab49f5426ece SHA-1: 3c6f30e75ac876411a91f094d903b90e135a0395 SHA-256: cabfbeef28e51d41a2e38ab82666425d47fceff6366d2786e759497d0852ae8a
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed to leverage search engine optimization on potentially untrustworthy hosting.

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://cructi.ru/uplcv?utm_term=how+to+cast+prime+video+to+firestick PDF link annotation
    • https://optimustelecoms.com/ckfinder/userfiles/files/77327091260.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5f396635fa16240ade6598fa115db4dc/66257543481.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/19930193994.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/68505831319.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/97227976074.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/zamotigola.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/82482061474.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/81484624049.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a4fc39d9---13482964630.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/pawanurekexaf.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/kazotesekekulexekiwim.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/pelem.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/82823912419.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kugozojomufazowanari.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/igpc604rr6d8dfph3ihl5sm630/kusebolewix.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/42915587920.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/zeruluwebego.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/vipumotedadafobonobutoz.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/dupalagutiwinizuf.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a87fc6f8e---17240527106.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wofiketazixemako.pdfIn PDF document text
    • https://izr.fr/files/bowekovemuginitofinabo.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/vudobepasezavexi.pdfIn PDF document text
    • http://mopron.ru/upload/files/33630428447.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/82760533279.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/pumupileve.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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 17420 bytes
SHA-256: 5e01d877c5e877730bf91ec457710769f32cc548d14f3c3d30af08c2ac2f86c0
font_02_sfnt_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 10868 bytes
SHA-256: b19a1cdbb02a6fdc43b983bfeb46ae2ad1ce3387b2e9e4522ce8151888282765

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