Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ab975326f514c9…

MALICIOUS

PDF

85.1 KB Created: 2021-07-05 09:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e6ac44563401d1cbdb48497e5d6bdfb0 SHA-1: 20f44a7ded824f37db78de3eed6c2961d4964248 SHA-256: 80ab975326f514c9f4d15b0e01a87e0e2e6a2a9f09b8087247268bfd4924a94b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites. Multiple heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f01ea0b5---56699332111.pdf In PDF document text
    • https://qqhanoman.com/contents//files/82941678636.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/53518378155.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/54415308036.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed3672d76032e1bec97d5b83f2253299/74372047749.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/penufojirafixu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/431ef25c6259c0584de4bc570c803af7/nunesaxiwetozusorugubov.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vcfblh8q0i774k6rdquk0apgl4/mibizikijeniwimasotaf.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qsermc0a8uij0ujva2cd0n4ni7/48133156929.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/sewojagaludepagolasek.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8d80bfb3628e5bb3ef699d8e709e853b/35124038886.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/m9510d7lavc88fllfam72isf31/nebemonelutikapubewu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2abb8101d---65770941240.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/d526b03o2rqta8ct0ck18fdcu1/52373991536.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635195b9a7---fonivudobezadufujiso.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pudozajebixobosogix.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/92566435485.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/81116677212.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/remiri.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mibamadu.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/digumopuzus.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421fecb2cc---vobudusoliwonamoturu.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/kanebedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=latin+american+educational+systemPDF 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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 17644 bytes
SHA-256: 35dea3e43a3c6b0a2bc4aa4bfdf80be0c2e8b78153d30ae9bcf7da521e7a0e21
font_01_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 10700 bytes
SHA-256: cad599eb8e64e213c0126ea7ffa1d5796aa3bb9050600ef9f541e213380c90d7

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