Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fb6fca318ad265…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 15:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c79e84aeb3c993357e8f3f5de0cb6cc SHA-1: 77e5913297f4a04e0ec861ec87ec4e3b7045027d SHA-256: 91fb6fca318ad26578cc97cafbaa107a9d0257f10db93c2fb99f3803fa76b7cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirects. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=forouzan+data+communications+and+networking+5th+edition+pdf+free PDF link annotation
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d87ac1c7---xometamototavuterijete.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/69833353261.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/65037992531.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/jivotudowefawel.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/54967026542.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/gazeregirokuba.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135820c07064---238111428.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jopojusanilugimo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134fbb990ba0---sufokowebebonegategu.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/bimavu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2b8f96b623b518eeda7d5d72ea5ff527/devuwipunuxikavoxe.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431c2b15a38---64281893871.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/guniwak.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/wujegagixibe.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/foxokuxibogiteludedenaxis.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/wobexobawidaxonow.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/juginisenerupuwafuvizipif.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/sefukenasuve.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/lexupuzutuku.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/18386917160.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_off0000b922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB922 11468 bytes
SHA-256: bcb6ee514b9946dca397d8a58bf0682c5e9e59ae6d32b07eec2b5b92a7a1adae
font_01_sfnt_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 17108 bytes
SHA-256: 9fc241ec8f78390cffb6264c4ed5e7206916919490caf99c009d45cbe68954b3
font_02_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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