Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cabd4d3103a456…

MALICIOUS

PDF

99.2 KB Created: 2021-06-28 22:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d5a60b8bc95adaba72865fc7141f290d SHA-1: 2fecbe10a361db9672891971a8791f42c044f3e5 SHA-256: 93cabd4d3103a45692123140d15d689c6aee0a74c30087d2a2d37d38ec43bec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to WordPress installations that appear to be compromised, suggesting a link farm for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hk7bmdgcnsmkeje5a00lo46uj7/38929666076.pdf In PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/vepugizomofogatigodeji.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/52621294270.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75b19ddd66---soxamefizipu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/oetar7shi1s87gf9q2ipod1tj5/kudidoromusepuf.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/40649774231.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/towujolozagada.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/bajegakawutoletifozewaf.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7335205cc---60876619290.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dbab11920---tubesabalabuposoju.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be020ddd00---32775201835.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/119cb949ae5bfc316f226f44e76d3c55/59389906043.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/movazonisiwipokimemuvibo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1eb7cd654f69e12dd67c7796ae01b195/manotisegifi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17a6c2a115---98552334117.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/efd1c8863de19cc40c6ebeeb3b53bcc9/21764615418.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9f1940c4441ceee1406b1ea88f54bcd9/peluwemevepotujixolarew.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6a2a4cf7a565db7e6415b694627c3ea2/16697926695.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/66108227602.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef07d5bd6---33637040380.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8846626e7f4981d55a98df47e2c2f82b/99783003378.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b50649c2---64873985626.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/d2b2f4625e8f2b8dea19399a99d1e545/wosotefegukanazimivijed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sister+birthday+wishes+images+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off0001368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 17964 bytes
SHA-256: 12f0084aa2bbf70656b06a3d54110f8938110345c926d0bfd22ed3ac5ac54189
font_03_sfnt_off00016522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16522 11108 bytes
SHA-256: 3d507d2a18798d35335962ca282a10c15bc6762e57dce881ed31598344f0083f

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