Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55b63a35b3d92bb…

MALICIOUS

PDF

78.7 KB Created: 2021-07-31 16:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e62ab9f57600cfa6860030d13ffb5e61 SHA-1: c13de1b71e791b35aeff4a6781c855da42f8d14b SHA-256: c55b63a35b3d92bba0122a59a00c8cecd7b45f3a182aab1dee6c6d80caa25ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest this PDF is designed to lure users to external, potentially malicious, content, fitting the profile of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b892ffca4dd---fojazitisozunuretasoruf.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160972b4b5ce31---53911900108.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb7789cae---lumubeduduwisulete.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/43128559005.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/81196691644.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073193e77e04---kabegexupid.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160796f7338d7c---zenomajizipizelovejuj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b888cfdedc1---92584045785.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033507403a2---xoxaledewafizirop.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/61990099815.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af58b4096ee---jawosorowikitirokojinaf.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/kasivebobopava.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/zesoxajoge.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/haauc41o27n2gmlckhbksh7l15/1385772676.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/ginajufu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a17dbd7bbcd---sazafalugijokab.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1c52d717a---43040600797.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7ea659944e3038fac5bb5ea2fc446887/48651335869.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/51715754581.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077557e9c75e---fasus.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e4db0692.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/kemowavumate.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/mijenuromikugonex.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465a9e301c---puzevazaterekemetowefipeg.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0c49575c27f2f421415cb95043fed244/61052021361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fsl+topup+config+filePDF 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_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 17432 bytes
SHA-256: 96c88e6da008fcb3d4e59dfe4afacf18ac2924431962682ec63355aa8ea6c40b
font_01_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 10468 bytes
SHA-256: 8ff1a9bd468f88193021e9a6f85905f6e0ebff29455f78ffdd33f4f192e57487
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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