Malicious PDF — malware analysis report

Static analysis result for SHA-256 51570d527daa5478…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 19:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49c5974a2e9e4416161d0c0e16adf095 SHA-1: 027d485a138ad6e719983b178752f72f7c830e04 SHA-256: 51570d527daa5478afc1fc292ce6161e371ca566b47e9c184b8ed2a308ac3d37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure itself is designed as a link farm, leveraging SEO tactics and potentially disposable hosting to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=locate+lost+android+phone+turned+off PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0a3ae071---rudunijiriduk.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/15841059416.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/panabodasasusuzodub.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/71393661664.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d10360fe4---45333430521.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/pikebo.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/90192945824.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/zemewukavokasizev.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/bekabezop.pdfIn PDF document text
    • http://secretinvitation.net/images/files/24907060128.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4888a9059---93509110523.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/87160657485.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/rajoranirulebiwonur.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/15209489935.pdfIn PDF document text
    • https://lesura.net/userfiles/file/85059049742.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/migowaxagezetatalu.pdfIn PDF document text
    • https://trexanh.net/upload/files/47037271318.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/witoxefuratuwuzuk.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-08/fbf5eeef4b4c16a65f6cd09bfbfaee9c.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/21446177715.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/32357997578.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/fobakiwivimoke.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/39d75084c33d15f5d252b6841d024a45/44241749540.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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 18864 bytes
SHA-256: 182b3146ac019f59e9795a1a72b5bafa5863e5176233fcbb6ac09aaca32dfe65
font_01_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 10776 bytes
SHA-256: 470227f0140d331f3d17f42145b2ecacc7855df0df3e81054abcabdc318db516

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