Malicious PDF — malware analysis report

Static analysis result for SHA-256 439ba3923396798a…

MALICIOUS

PDF

91.1 KB Created: 2021-09-05 09:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92da330eb510eedda1eed973cd8dae23 SHA-1: 306a75d12c8ccd518c054c45051e5cfb04659545 SHA-256: 439ba3923396798a01560dc99c9e5e9fa05d5182ca60072de2b31f42d3c65460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://osiindia.org/ckfinder/userfiles/files/49489615981.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bbb8027b7397cd83b87071e0386019c6/jemuxu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/52c95b72bc12e482df15f4deca222b14/70766202282.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/dewipuvulonanitome.pdfIn PDF document text
    • https://duel.pl/userfiles/file/27309187583.pdfIn PDF document text
    • http://maidichike.com/upload/files/40088423592.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/54935326072.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d59d9cf40---96214411841.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aeed63e33---29681137406.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098892b5e6a1---kasebexakidofifefefujami.pdfIn PDF document text
    • https://soechi.com/userfiles/file/80515203427.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/19075208290.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8232ef779---50519247759.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee3cdf764---22177633685.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/jedodewemebiputitu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160740fe4da6ad---xelobumuxurom.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c77aaf01cf2f34c0e516da0ec16880f2/14116412620.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/2627613138.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/35902195610.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef77ca35a2---wivajulija.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/88679813920.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116912980fdf---37143637449.pdfIn PDF document text
    • https://hinaweb.com/upload/file/92389287277.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/jotirujokinosiviperomene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ticker+timer+experiment+worksheetPDF 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_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 10672 bytes
SHA-256: 2d2aa2cd2689673947fd3d62dad28ea8602c0c46d8f1d3fc28737bae5e0e440a
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 17488 bytes
SHA-256: 598dd8491ccc1a1357c9f18a4095fef8cc09f83d23035c632ec455de7100e176
font_02_sfnt_off00014697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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