Malicious PDF — malware analysis report

Static analysis result for SHA-256 22db1cf0bc1d5526…

MALICIOUS

PDF

102.4 KB Created: 2021-09-07 13:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24d8174a427892ef4a4dbd007cd0b00e SHA-1: cb0e597e8ecba2c61a5d6adcfe02bdc9f5b00830 SHA-256: 22db1cf0bc1d5526b53e7b03cdd9a68d57f939582f3f4af3c63d3acc04234276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to WordPress sites with form upload plugins, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters in one URL further support the link farm and potential SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4395ce8bfd---fukurubivolekusuguvagef.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/o38ro74ai8gjkgo5j1j44n7815/daruzemiluz.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/73519122305.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962187b0f80---315200080.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607881914e31e---63685927431.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f553b10149---luzeja.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/coe64l68ccgo0ub7pfqjfscr04/11859156768.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/26666007395.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cff993837f8---dozeworevolameji.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b3p25341e9aevvdgrc6d7ffe7p/96143961019.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/95672595124.pdfIn PDF document text
    • http://kme-kme.cz/files/file/44815144563.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed5566dcd---8693698242.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/53523414156.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/mudosaxadosufu.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/4338966221.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/milita.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/11108714370.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bbpe4d58o0rbthccvsim2ktfst/37756177526.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ea01b09116d63d9d11965cf32079f2d6/xasowotelutokukurebuva.pdfIn PDF document text
    • https://botroul.be/uploads/29789252316.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/zuzuvisutasenejobik.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/69762181942.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/visugupudipolabafup.pdfIn PDF document text
    • https://lecachet.fr/docs/files/34823949153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cours+de+droit+civil+congolais+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10992 bytes
SHA-256: d0f24fbd654ddf77812af0da569c73c69ed445a394b9d0a6404933bde21485fe
font_01_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_02_sfnt_off00013ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C6 22956 bytes
SHA-256: 8145d8bb68f1cd5454a6c997dfc6b8dc0e16795e888f3d98bb46bae709aa9816

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