PDF malware analysis — malicious · 369a157f77c3c14f

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 05:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 6cb4b8c760376443bd04b80cce0f4143 SHA-1: be8f9b5af2b1c9d8f22ba5c596817f3efd13e748 SHA-256: 369a157f77c3c14fc542e0463de725ef10ba60df5142a55f20c48bc7efed3357

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common tactic for distributing malicious files or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141105a79d9f---xiterejopovonomogi.pdf In PDF document text
- https://saikekanglun.com/filespath/files/20210903061319.pdfIn PDF document text
- https://benmoonpharma.com/userfiles/file/bumojunefituxo.pdfIn PDF document text
- https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/83039823956.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ffa59a949---20681361078.pdfIn PDF document text
- https://vhcvietnam.vn/ckeditor/images/files/kuzegewisewe.pdfIn PDF document text
- http://musikpark-live.de/userfiles/file/71706106295.pdfIn PDF document text
- https://red-adlay.com/upload/files/fizugudujopoxu.pdfIn PDF document text
- http://zjgyuanhong.com/v15/Upload/file/2021981136282703.pdfIn PDF document text
- http://zjgjqmr.com/v15/Upload/file/20219141643247074.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337e86ef70d---nufazesuwemomamosesexegov.pdfIn PDF document text
- http://space-edge.com/upload/files/dupawusu.pdfIn PDF document text
- https://dichocungtoi.com/userfiles/file/sozepekuwewosipa.pdfIn PDF document text
- http://saluteebenesseresas.it/userfiles/files/46167423230.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/97g7ncgmh9m10lmu2j0iqbq6fu/gujajidepudij.pdfIn PDF document text
- http://casaatlantida.com/userfiles/file///2035874771.pdfIn PDF document text
- https://soi.icami.mx/ckfinder/userfiles/files/26174844033.pdfIn PDF document text
- http://bualuang101.com/backoffice/upload/files/28302496090.pdfIn PDF document text
- http://jjw-led.com/userfiles/file/34803045596.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fe4629c7---58567032405.pdfIn PDF document text
- http://idolyokocho.com/js/ckfinder/userfiles/files/fuzeg.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0554f368---jitiguboveripuketuw.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ca642533---tewebosidakosodafamaxiji.pdfIn PDF document text
- https://abss.pt/userfiles/file/25987199632.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gta+v+ios+file+downloadPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dca0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCA0	17028 bytes
SHA-256: `7f9cad521ecbca2c5a334787fafe08709257ff59724c30c6eea47e6b9a2e6612`
`font_01_sfnt_off000108c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108C9	10436 bytes
SHA-256: `f207e75ebe6a8c76ea7f7f88c2e62d52060343a23a64f611946e5279e3c29b5e`
`font_02_sfnt_off000120b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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