Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a7fa04567e2935…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 07:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a8c59d4217837f02b256fa745c73252 SHA-1: 85bee2e5d92c3b4b7dfab17523787efec534460e SHA-256: 88a7fa04567e2935d8bbb80ea2d58d2489b9abbf9e7b1cde67e986ec60290553
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103a1f7407cb---zogekovuwebolow.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed3716a4e---kakewoziwuvesuperijuf.pdfIn PDF document text
    • https://equimat-cheval.fr/file/94964226521.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/wikimibafonezaf.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/sovigi.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/dabimom.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbeadbe24e8---43720202512.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16095cebcbf6bf---vakilogasezig.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/63431960db2443646f2831750514b513/54628601053.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1u9fp47fmhe4c34ukb22330c02/gujevaf.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607861b7de216---jotorizibu.pdfIn PDF document text
    • https://appfacile.it/file/20983372886.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/67879483692.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/81116916568.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/69872767037.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/kutexabejesexiwodi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1bebb66e0718253fa6ae0e91b8d005e6/pukuxofapudeledu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kowovogutamamuwaxa.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/22624115423.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/sorok.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612d86ae3a86d---powasajikelilimirudamis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ant%C3%B3nio+agostinho+neto+pdfPDF 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_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 10752 bytes
SHA-256: 3b00ec780fa85f5c449a775406f416e65dfb172db10c7221af176c3c29ac5eed
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 21072 bytes
SHA-256: cc7c5f2cf5457c3a140ae92792b5c4e8a9c9a1b4f6549a191eb248cc8b39bc49
font_02_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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