Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9328b0265ce543…

MALICIOUS

PDF

79.5 KB Created: 2021-07-14 09:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b1acab3907e3ef7695106f9664ad868 SHA-1: f7dc530116c1a67c2199e68584f9e8b6659c3aee SHA-256: 4a9328b0265ce54358bef8199d75ee1ca30fc5c8555fbfadd90d0d0c45a7f536
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, utilizing a link farm hosted on compromised WordPress sites to redirect users. The presence of multiple unknown URLs, combined with ClamAV detection and ML classification, strongly suggests malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to deliver a secondary payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087573e350f9---64553424634.pdf In PDF document text
    • http://erex.hu/upload/file/lovomozebep.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/gerinopoliror.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/segemowiko.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6ab7678c368766cc8a7e3276780018c3/32746978606.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f3027759---18707841250.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/18647607124.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609892367f9d9---mivajonovokorex.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/547f58e5881810f897323a72a5a1764f/tibinujigekupesozi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bbf5c1dca---wonadasakadogetikif.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/janifadosumesew.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13213362165.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9a3dc7d49a6b81ef452383fa1e12c728/divotepasobu.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/76078619465.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/magexupisozatemetu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/6981985784.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/87236148037.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/gexaxobududasof.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcdba90c80---68692738467.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/gibowepubawelo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/saponet.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2922fc57a5---32519634685.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/020bcb5101895e2fc416b5db049af492/rajigogulepujifenode.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/likibomevavadakuwomorowib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=powerpoint+pc+free+downloadPDF 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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16908 bytes
SHA-256: b1f431fd866b5b6ca8df149c102fa7be80ba48adf85d16cebd6bd2bcf1fd2086
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 10532 bytes
SHA-256: 8eaaa4bd36c46efa5928e9271d05d01c376bcfc6f21c9f2f33a2c37bd2ab3184
font_02_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1