Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13c94b38c60cd7d…

MALICIOUS

PDF

224.0 KB Created: 2021-08-08 14:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2420fb838f6a2c0c42878ac97bf6c215 SHA-1: edb7e8a774b449cdfa305878162004de0f589ea5 SHA-256: c13c94b38c60cd7dbb9cabd7da90b88c7f4c8798faadfa96479e85b6e0540db9
66 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8740

Heuristics 4

  • 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.
  • 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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/038d62041454c0c3079c885303acf6b8/83024038390.pdf In PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060323000673499.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/faf12aae89b22d3838e2e76e851daec2/90803748171.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/14356926252.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/pojipukorovivifawu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/62aae660fe29273de2fac747e7b7ae24/vijedewalofekij.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/jufufixekekiduwupixasuliw.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/kagopesaripaxeg.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e444bc7d7---3414899349.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/61662722422.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/esush3cc9epijuolumu7gds26j/91001878942.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/3721557976.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607816764c5c2---30580408587.pdfIn PDF document text
    • http://kezmosas.hu/files/file/wesozivabixepenajepigor.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/72383790422.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/66785140790.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/enh91q3f4ricf3do114k9bj9c0/93403075088.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/78681445950.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/mamasamobafuzabixeruz.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7c0b31815e326fe5d111fbe4e2ae7fd2/rujekajogixir.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/foxijojadok.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bavewagijenov.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/mupuresusuj.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/69324351164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=warner+electric+clutch+cross+referencePDF 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_off000313fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313FB 17008 bytes
SHA-256: a419b1ef0953d1a7f41ee99a2d4204366120a1fdb2c51feeb9af3a28be2bd0c7
font_01_sfnt_off0003409b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3409B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000358b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x358B2 10528 bytes
SHA-256: 84341ca0b69b13127b3dd35774f15dc1797b8d7173dcd0e7d07c6426863abf3f