PDF malware analysis — malicious · 2a43319d39d8745f

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 07:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: d34485a452fcc374724d7105cf0d4821 SHA-1: 92581cb62917bde3d68e8dedcd8732c15404303b SHA-256: 2a43319d39d8745f6d4031ef9c8cc99d7e6987e2d3411a8fb8e385d9315a62c5

104 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 or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further payloads. The ML classifier also flagged this PDF as malicious. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities, contributing to the overall malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.7657

Heuristics 6

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://anna-bel.com/app/webroot/files/userfiles/files/zuluwalupevo.pdf In PDF document text
- http://caogenzhiben.com/filespath/files/20210901082328.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161412b13b648f---mulezotew.pdfIn PDF document text
- http://vektorma.ru/uploads/assets/file/luwenida.pdfIn PDF document text
- http://hsi-international.com/ckfinder/userfiles/files/zekep.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s5i0pcoeg0o4ar5a0pcdq34u39/2955277804.pdfIn PDF document text
- http://gospelpour100voix.com/fichiers/newsletter/file/56117141719.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pmndmmbivc462f4ppjctn85q04/30172553671.pdfIn PDF document text
- https://coimbatorepressclub.com/FCKeditor/userfiles/file/85082914094.pdfIn PDF document text
- http://urs-certification.com/gais/image/file/57060163243.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd798efb0790437240c8c634e7db988f/mitizufosevidemoradufaf.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8dc59a35---baxateniluvudo.pdfIn PDF document text
- http://showplus.ae/userfiles/files/bodivolaxe.pdfIn PDF document text
- https://villatoscana-pi.it/userfiles/file/zimum.pdfIn PDF document text
- http://sirindhorn.net/upload/File/gotezatusebu.pdfIn PDF document text
- http://pelejas.com/IMAGENS/CKFINDER/files/94830595957.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783b147ed5---lepapugodilamisinonoloniv.pdfIn PDF document text
- http://garage-ys.info/js/upload/files/wumixuzemenijudozowiwa.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93422427046.pdfIn PDF document text
- https://cvssteelex.com/ckfinder/userfiles/files/7939746202.pdfIn PDF document text
- https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/96754157163.pdfIn PDF document text
- http://moscreen.in/cmsfiles/file/mulavoduzozi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+go+ipogo+iosPDF link annotation
- https://lapdonline.org/file/rateriziponosugav.pdfIn 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e26c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE26C	10284 bytes
SHA-256: `b2b0efffb9bc007589f0552abbf75aeda7d0bcb5c14502823227c4c7df80ff8f`
`font_01_sfnt_off0000f987.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF987	18548 bytes
SHA-256: `907a8e4056bcb067d864d5e3dcbe973ec3b5b596bbd6ea2bb8d08e285b42a919`
`font_02_sfnt_off000129c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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