Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5b647d7d30c423…

MALICIOUS

PDF

93.4 KB Created: 2021-07-20 17:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5789b8a98446a93d144d92e1129b31fa SHA-1: 145c4ed06210072f89cc4bb34964266e69765e81 SHA-256: bd5b647d7d30c4232a5bc343564df3a98658749ceca39a386a80a9b5bfa13ba1
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

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 http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2c2e4f2f0cc1d961754c4b913440dc48/65306739297.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/q63sj1u73fbe6r27ejtq0dc9ff/33577361599.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/67848503202.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/14288539854.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/paxekojesamuguloruve.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1f36ba65---rosotuvuvu.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/7569598501.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/56c5963000024cdd53fa0af68c4a906c/kuzuxagulex.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607853aaf01f5---221895543.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0e023193---wozasozozazukawose.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/42169624173.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/lalenadisafizej.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4109c29a---6819219301.pdfIn PDF document text
    • http://www.toptehnik.si/images/78230416085.pdfIn PDF document text
    • https://doganagolosa.it/file/14675546064.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/81290691083.pdfIn PDF document text
    • http://jucal.es/images/file/zumawimekuzofijunojul.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0176c3bc2f---23189293892.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609486d1397e8---8570049101.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/dqdupc2k9u1o5lhtvijbilrp21/kejopuvixig.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/nisavoxazosinurafuda.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/gebeferawopulaxe.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/83465928066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=enolate+ion+formationPDF 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_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 10188 bytes
SHA-256: 387f774b932d0c345d769056c684859d044de089c9dfed63ebc65e42016964a5
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 17972 bytes
SHA-256: 2e78fb0358e078f8c81ac67dceac7ab949448a6ee394879dd4a84c877a324509
font_02_sfnt_off00015072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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