PDF malware analysis — malicious · 9038d9f21de4d04c

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 10:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6290a64ff194bf4ce95622a6a38565e9 SHA-1: 673424b0182f063654a4c406a4d8d11d1844fc1d SHA-256: 9038d9f21de4d04c1d0819b26e9dd0336cba036a2a3ff77e2af86264c9b48710

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/38587447192.pdf In PDF document text
- http://zeci.nl/im/image/13841494614.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c6383adc4f3454eb28c38df0ee78e1ce/tipejixadexubusi.pdfIn PDF document text
- http://hiace-yoshikawa.com/js/upload/files/tebakivigutotipomuguge.pdfIn PDF document text
- http://rancholasmonturaspremios.com/campannas/file/kozokuwizafufojumut.pdfIn PDF document text
- http://appli-veolia.net/ckfinder/userfiles/files/67486592923.pdfIn PDF document text
- http://abwmechanicsville.com/uploads/files/79550485237.pdfIn PDF document text
- https://akproauto.net/nbloom/fckuploads/file/wazawimoziv.pdfIn PDF document text
- http://www.pacautomarketing.com/file/dewogugunofuwerorotan.pdfIn PDF document text
- http://hophungvietnam.com/app/webroot/uploads/files/2077162592.pdfIn PDF document text
- http://udokutscher.de/gfx/userfiles/files/85617224896.pdfIn PDF document text
- https://systematix.pl/userfiles/file/fezosubox.pdfIn PDF document text
- https://www.zolmedis.lt/ckfinder/userfiles/files/xogekufoza.pdfIn PDF document text
- http://osteriadelcampanile.com/userfiles/files/44554763931.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/259090bb2378dfb5d977328c8b4da6e7/86002118935.pdfIn PDF document text
- http://ipcmanpower.com/admin/style/images/userfiles/file/28210563106.pdfIn PDF document text
- http://sevimticaret.net/userfiles/file/zifavato.pdfIn PDF document text
- http://glavis.biz/userfiles/file/13873410167.pdfIn PDF document text
- https://airshow-bg.com/file/tamesujonuxed.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0573d36bc---12178246779.pdfIn PDF document text
- https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/74956940891.pdfIn PDF document text
- http://jycjqj.com/uploadfile/file///2021090612113542.pdfIn PDF document text
- http://cmtl.in/uploads/userfiles/file/file/tibotujekexifesitilus.pdfIn PDF document text
- https://lajovisena.com/gallery/file/28228954131.pdfIn PDF document text
- http://fresh-j.info/images/uploadedimages/file/15660453157.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ringtones+directory+androidPDF 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_off0000ebe6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBE6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000103f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103F8	17620 bytes
SHA-256: `c98d3b0f9d796ca5471244128170bd9ee096c19fd0d994e5c58595e659547f77`
`font_02_sfnt_off000131ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131EE	10656 bytes
SHA-256: `2b8f797bc95da5418330213cdeb55bc6e756e177078a4444f009b29f9fc3d8d9`

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