Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c968343f1be35…

MALICIOUS

PDF

107.2 KB Created: 2021-08-11 16:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e06680bf0e206a8f21986e53c1f43ec SHA-1: fe048c6301adde103bd22d6b48c3c2e6b0d6fad5 SHA-256: bd5c968343f1be353b4dace38bed6ff15ab5dee0aa2a47036f69e96e877703e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cortemadera.com/wysiwygfiles/file/pigajikoto.pdf In PDF document text
    • https://najlepsze-w-polsce.pl/uploads/7579856476.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/rivamizuwelajawobaf.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/061011258422.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874dd257d0---rejitizefubabapogorimo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/bd28f298d1b6cc7fa903545dd003537a/vatigiwufavixuwedoguge.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/xonupukuwejubimefo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/642376a715883ae9d88971d91c12bbb8/webowenemaxivulofefipot.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c2f4a10d2fa50558fc1d6b8a73f20ba/34000132399.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/nuwugojanizunipitipiza.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/tolajijedeberik.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2434ae07e1f7cc793305dfa8211957b6/45014674335.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fede3ed0f42---tuxapeduzajopagivuk.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/57188280065.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2141ff56c11e0a86394e3d5f397f9951/53359326503.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7a38fb4b---79010611763.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/gomutavelaxazefikez.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f01306e45cdad2cf4e01b03a58ea3f2b/revirubenenov.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/22618107521.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/68247899630.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/mugidug.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210805012723_bane9t.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/24945958654.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lofisuvof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ejemplos+de+estrategia+global+puraPDF 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_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 10984 bytes
SHA-256: 3d43e5689785e69662e78f65189301aec0996bed235b6258961d6758900f1f7e
font_01_sfnt_off00015481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C93 18620 bytes
SHA-256: c74b2fb14e8aa37d8bbaa36746faedb76c3b02bbea0e8425d9c89bf29307070a

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