PDF malware analysis — malicious · 52c3fa06e67ede7e

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 23:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 47243c1488a3f6301dabafafc3ab5857 SHA-1: 406e0192b1d5c8aa6bc8922e9ea30d0bebf6fd6b SHA-256: 52c3fa06e67ede7eb3befacb3950f2e46824ea36c5564899e946cde637a1c4a5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The numerous external URLs, many hosted on compromised or disposable domains, suggest a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing lure or a downloader for further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=ccna+routing+and+switching+notes+pdf PDF link annotation
- http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fiseje.pdfIn PDF document text
- http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/81437352191.pdfIn PDF document text
- https://pepinieramontana.ro/ckfinder/userfiles/files/lifan.pdfIn PDF document text
- http://strap.sk/uploads/files/pinalulovizemafuxi.pdfIn PDF document text
- https://vcubusinesssolutions.com/userfiles/file/69531024213.pdfIn PDF document text
- http://aliceinformaticasrl.com/user/pages/50742059802.pdfIn PDF document text
- http://regalmotors-jp.com/js/upload/files/53022276736.pdfIn PDF document text
- https://kudamatsu.org/userfiles/file/1848614164.pdfIn PDF document text
- http://wisdomtours.net/upload/file/kedub.pdfIn PDF document text
- https://topconta.ro/userfiles/file/vikaxixufuke.pdfIn PDF document text
- http://studiotecnicolamanna.com/userfiles/files/43184068038.pdfIn PDF document text
- http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vobd1cc9qd32hchr0a9ff2mcp5/52482977733.pdfIn PDF document text
- http://ghibms.com/userfiles/files/62655632894.pdfIn PDF document text
- https://cli-kh.com/uploads/files/202109041035074112.pdfIn PDF document text
- https://yenhuy.vn/upload/files/66823470448.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8af4acea4---29117676248.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613386e8b0818---61970079793.pdfIn PDF document text
- https://baatco.com/ckfinder/userfiles/files/wesapasikodubip.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614169316305a---porimafoguju.pdfIn PDF document text
- https://raselapp.com/userfiles/file/40639278612.pdfIn PDF document text
- http://www.ishvani.com/www/js/ckfinder/userfiles/files/41042488516.pdfIn PDF document text
- http://neoneophytou.com/ckfinder/userfiles/files/wekerodizapafil.pdfIn PDF document text
- http://oresteruggiero.com/userfiles/files/falixamowalum.pdfIn PDF document text
- http://ashole.hu/UserFiles/File/kirekefubiketegaxile.pdfIn PDF document text
- https://bisleriuber.genefied.co/ckfinder/userfiles/files/gejarovexonoxivapofagoz.pdfIn PDF document text
- http://bjsddesign.com/filespath/files/20210903114904.pdfIn PDF document text
- 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_off0000cfbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFBE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e7d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7D5	11068 bytes
SHA-256: `1f63ae3cc061d7be1a5139b69fcd9c0fc51796d2c0d397e5b64e8939f06214be`
`font_02_sfnt_off00010171.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10171	19704 bytes
SHA-256: `6aebfeede1fab80ab6f20a2b745e531e6b43ad9efac6b286c450e08ea4675346`

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