Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4ce34b158057dd…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 00:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0511378293bf11be0166079caddc8a01 SHA-1: 88083f4d76c27924edb3972f45321d8a3db3995d SHA-256: cb4ce34b158057dd6808e139da83b882f36866f2f3a0cdca3ffb3c163edea410
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically classified as phishing and trojan activity. Although no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9f514f72f759746e66f0f49f642cd492/69024799955.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1eed2e00c---zuretexefuz.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/nofivetelotapididewapona.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bvbf0pcluldjphem22fnaevou4/74390160424.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kuniwonubufi.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/82242272371.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/053bfadc4a287542c7492bd3f8b0b318/81228196842.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/vurisede.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b266d0b0c43---wutopizupapirasi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mg4hujadftcf2iopug7nlinnlf/43142876355.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87946978544.pdfIn PDF document text
    • http://chongros.com/userData/board/file/97885291931.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/rewisaxozajar.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ef358b11b---pesirukezarexofunof.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t3e4966l5clajgvbg584ms93ar/dezurilepa.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/pakidesevumufatoje.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/purufofaxemi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/86287492057.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085253090dc2---15585426833.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/22089122185.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791c8d99a80---75455757085.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210618094152.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9d538d4d---ribifujejekudufomozalakod.pdfIn PDF document text
    • http://cascad-trans.ru/files/53841288835.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i86jrv3imt2r4oleg8es2jjm44/zasifigexujulinikeg.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/jenetimuxodu.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/jojof.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/21149760761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=prisoner+of+azkaban+pdf+archivePDF 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_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 10932 bytes
SHA-256: 9b86b1f263fc62cb9fd78473fb6a9390c10165c7a4402579f34ff792b9820d4b
font_02_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 18064 bytes
SHA-256: f4b91ec277089c9747828a7880972d214a76dd9add5a711e4aa61dee89828668

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