PDF malware analysis — malicious · 4dc175a7ed122934

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 05:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6ef9be1340756653ab37a29b8940c58c SHA-1: b916aec8d85e5cdd4f7e1e4c4637e15b687df39f SHA-256: 4dc175a7ed12293491baa0442c2c6aeca60f5e13848b512aac65326484853c1b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, likely to host phishing pages or further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded JavaScript likely facilitating the download or redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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://oniceh.ru/uplcv?utm_term=network+sniffer+android PDF link annotation
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zubisu.pdfIn PDF document text
- http://tai-yang.tw/taiyang/upload/file/40372305731.pdfIn PDF document text
- http://steinbach.casawell.tw/userfiles/file/10388022480.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/92da02822f9035447f0aed4161cddbcf/94216746367.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/c1vsn8ltbbfl9kmi4est1nnou2/zapewazenokaleniweg.pdfIn PDF document text
- https://partroyfuneralhome.com/partroy/assets/file/84256091426.pdfIn PDF document text
- https://underworldgear.com/upload/users/files/wenilurafipolazosow.pdfIn PDF document text
- http://studiozammuner.eu/userfiles/files/25878402431.pdfIn PDF document text
- http://elencostruzioni.it/userfiles/files/podusavo.pdfIn PDF document text
- http://thechitay.com/uploads/userfiles/file/23477921692.pdfIn PDF document text
- http://studiotecnicodavico.eu/userfiles/files/3815000321.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161382a0e15cf1---nukokozemunazebinus.pdfIn PDF document text
- http://www.yt333.com/userfiles/20210911/file/1631364128.pdfIn PDF document text
- http://edukoc.net/userData/ebizro_board/file/gesibew.pdfIn PDF document text
- http://naturestuff.nl/siteimages/file/55071625961.pdfIn PDF document text
- https://atlantidegattico.it/file/jotanewakejum.pdfIn PDF document text
- http://szyoujin.com/UploadFile/file/20210908142713376.pdfIn PDF document text
- https://4of100churchstreet.com/assets/media/files/labawaremareluzufivatoxi.pdfIn PDF document text
- http://thevisionkharj.com/userfiles/files/regexibamid.pdfIn PDF document text
- https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/7821e5cd6816f0eb58716f09e8f2c6da/kuganefixera.pdfIn PDF document text
- https://doan295doson.vn/namthuan/images/news/files/sakafebefarudit.pdfIn PDF document text
- https://bruceautoservice.com/files/file/48185012413.pdfIn PDF document text
- http://zgic.ru/!upload/files/vapuvarekamab.pdfIn PDF document text
- http://pro-customer.de/userfiles/file/57754783533.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_off0000d9b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9B4	18184 bytes
SHA-256: `8948c6e2abe3f6b1c6d651245000da8431ed53b34edad09d6407650f7f7597e1`
`font_01_sfnt_off00010922.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10922	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012139.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12139	10456 bytes
SHA-256: `76ee2fa4388297ea41744a3ef9b9a00bdbecaa5d74589838c553f60dc8aab05c`

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