Malicious PDF — malware analysis report

Static analysis result for SHA-256 742f6be1292ac711…

MALICIOUS

PDF

91.0 KB Created: 2021-07-19 03:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 74a7e20df21f8c6b6ee24c0a50842337 SHA-1: cd2d8502081f4e19bb3244e4e1a4f0a978ad3e42 SHA-256: 742f6be1292ac711201c596b518d7ec5525a5a4bef162a87d13138bd544307f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, pointing to multiple compromised WordPress upload directories and potentially disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2f910a7935c68c9a365e3f3f5b197d60/59751137213.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3348d656c7---dofamasivapabekelof.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb4daa043---kalososutimagofo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3985375be7---gozewotibo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/virefufomosadamovajamo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4373890217---kudinina.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6dd29fdbf76eb33e7f9e6d64932617a6/52152818972.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gn3nac501jot713mksprgb3if0/22734241335.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c531917ce---gaxevigere.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/penadibu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/wopesufo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/erjmnu51sc4kbb21paikhrd6fb/kokasemenuliwepal.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/poxeje.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160845d2214d42---pomenezipakazudabevarowov.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/fexedasidiraluj.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad46bfb7e---wusizebewewekili.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/59536928631.pdfIn PDF document text
    • http://imi.vc/upload/files/xenuwutobad.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/4430f25d18f572477659cf1ddd9aa555/73578309904.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/jumebabopegufu.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/90496014640.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/76666663269.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831f90cbdb---ropab.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/nexupujelapoborisiw.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bac069dc1ff---tamumepuvirosidubisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hagia+sophia+to+become+a+mosquePDF 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_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 18768 bytes
SHA-256: 563ae2ffd5bf41caee9ea74a7cd1be0d226d2a2efd844b5d91bfd56cc2f7f129
font_01_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 10948 bytes
SHA-256: 9cbb06eac02e6e89bdee988778464d36ce15b3eb9b10c7c4c76f00d82b2a8d6c
font_02_sfnt_off00014687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1