Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7edb95882fd5fc…

MALICIOUS

PDF

72.8 KB Created: 2021-08-28 08:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6402b072eba2060475068c17981039a SHA-1: 26b26b9eb04b4e083f0a86b0e11f60a9a376b982 SHA-256: 2c7edb95882fd5fce154de17075047ad733ff2fd05fdd6c19f77e3cfd97bd28d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains. Heuristics indicate this is a link farm, with some URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://praguetransfer.com/files/file/wazisironupel.pdf In PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/43577815430.pdfIn PDF document text
    • http://cochemical.com/upload/files/81695978720.pdfIn PDF document text
    • https://lemanssrl.it/file/maziwevevadatinibodovoji.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/29954929622.pdfIn PDF document text
    • https://artenika.pl/fck/file/gerimolidorosarolaneg.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/norawitorejevakisola.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/37999601906.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/292ec4b41d3391acdfa9071c39544500/29129752295.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/34989819524.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/94419275830.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/bivatitiroxuzabivudoxep.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a0bff445943f0481dd841d2befa02cc3/lifikanoxexowojel.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/16603647116.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/87224621475.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/gu63vf8mvd2713568lmju4ohg8/19407221172.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bae9708b996---66324120405.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/72633973913.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/96151061270.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607560c33bc5a---rapoxapuwimorugifapoj.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160980a29007c8---futigapavanudoju.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/dipedojone.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/86041788018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=boxing+king+star+of+boxing+mod+apkPDF 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_off0000bc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 15460 bytes
SHA-256: 2017845a55b1d6e6cf350fdd6338602003d4a4799c60ba26552c43cbf2d7e561
font_02_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 11052 bytes
SHA-256: 9a09fb581e0297f55b91a39d7d81202b4366a19bb775a1aeaf40b6db62b043c3

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