PDF malware analysis — malicious · 8efda02fff7b670a

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 00:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 9bdcf54fea65fe689b092751963d84ff SHA-1: 57f3c70cc1240ea63dc9f420ed1a4a69bdbed94d SHA-256: 8efda02fff7b670a2a062131eaa6d07e8ed07eb04f494242a89315e4f41a3e32

162 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.7354

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.
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
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://cayxaotamphan.net/userfiles/image/file/vuvagipujed.pdf In PDF document text
- http://vagtteam.com/userfiles/Files/60835690004.pdfIn PDF document text
- http://zs-oilfieldequip.ru/d/files/43152620512.pdfIn PDF document text
- https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/1058302149.pdfIn PDF document text
- http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/69370239822.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148f70b3f4dc---durobitajeruridajakod.pdfIn PDF document text
- http://bn-biz.com/userData/board/file/kenonubipokazinozaritur.pdfIn PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0e316f7a8d9e98d08c92de0f5685f5e7/fatixiduvabemofogabif.pdfIn PDF document text
- https://kawanmto.com/contents/files/woruzivipubaketejajome.pdfIn PDF document text
- http://garmaclima.com/uploads/ckfinder/files/pexepolovugazebi.pdfIn PDF document text
- http://xn--80aamwn.xn--p1ai/userfiles/file/57260471976.pdfIn PDF document text
- https://snapstudios.ca/userfiles/file/tigeweji.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f9397842---33968089601.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/029f16040dae6a51b4085c0c655265c8/binaxuw.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/466862d90b9b57a8bb43c9a5bd137666/tapigulekinezozamod.pdfIn PDF document text
- http://khonggianmang.com/upload/files/24234865570.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136e82e0c96d---42000919376.pdfIn PDF document text
- http://mdsalon.ru/img/lib/file/15461046208.pdfIn PDF document text
- http://gyogytornasz.hu/editor_up/livaxetomo.pdfIn PDF document text
- http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/59703420362.pdfIn PDF document text
- http://petukmahaaaraj.com/userfiles/file/66599997475.pdfIn PDF document text
- http://naosgym.com/userfiles/files/29862765257.pdfIn PDF document text
- http://vet-arrighicolangelicristilli.eu/userfiles/files/bafobefipivu.pdfIn PDF document text
- https://10fci.org/userfiles/file/wubevawod.pdfIn PDF document text
- http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135afed068ae---pojevirawosirisa.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=smartphone+qr+codePDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dfc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFC8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f7da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7DA	17664 bytes
SHA-256: `ba2a21c961c8c1529682f7ff2f7dbb13a481df135bb333121ec9d419e4ea3da7`

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