PDF malware analysis — malicious · 3aa181c6e048e556

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 02:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0f0bfab95430e31e266086246ebbaca1 SHA-1: 3439d42df4d95cc21280149f9812cc67641f8b01 SHA-256: 3aa181c6e048e556be8b52757f5e0ad118617e25feadd9939c2df7d517fd6e38

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, a common technique for executing malicious actions within PDF documents. The numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggest a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely used as a phishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://strechybenesov.cz/content/kezenavabagufuzimegimem.pdf In PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160932fddab522---9698324765.pdfIn PDF document text
- http://stainless-faucet.com/uploads/htmlupload/files/81252326551.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/svnbls7215fli2dq6cvngit4je/fufixotaxoranumosogide.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf74e9336---64421868245.pdfIn PDF document text
- http://llux.vn/uploads/files/towexumo.pdfIn PDF document text
- http://dydlhx.com/upfiles/file///83521736077.pdfIn PDF document text
- http://gowowdeli.com/uploads/files/semitagebuzosexon.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bf33ad87---tipilixutegositewakajer.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/pu2h16grt1q6ur77q0hh76ds3q/13311638188.pdfIn PDF document text
- http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/64843107950.pdfIn PDF document text
- https://landatur.com/files/galeria/files/bokipifakutasikutigeso.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b9e9d6694---5253510068.pdfIn PDF document text
- https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fb4bf7c23cec38692ab16256c3be6cf2/71944997455.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b45bcedefd8---41275239420.pdfIn PDF document text
- https://newtech-utm.pl/userfiles/file/susigoparemegipokosep.pdfIn PDF document text
- https://signika.pl/Upload/file/vedakososigugajusukejo.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fbfdb8dbf---59142416674.pdfIn PDF document text
- http://happyland-nsk.net/ckfinder/userfiles/files/xilitulejozereta.pdfIn PDF document text
- http://bmcnx.com/userfiles/file/58281223597.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416a882da5---93498654313.pdfIn PDF document text
- https://harryfok.com/ckfinder/userfiles/files/3445378468.pdfIn PDF document text
- http://ncfc.com.tr/ckfinder/userfiles/files/figevavoxe.pdfIn PDF document text
- https://yoimart.com/upload/file/20210902222630.pdfIn PDF document text
- https://akemi.ro/hirek/file/9433003929.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fredie+didier+jr+direito+processual+civil+pdfPDF 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_off0000ea17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA17	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010229.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10229	20840 bytes
SHA-256: `4a44bf21f560dd04abd1f090966f5b25ed95b1597e4591aa94aeebac23901553`
`font_02_sfnt_off0001390a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1390A	10784 bytes
SHA-256: `4c1d43ce7955caa4f035a4eee17fd347d59b67bf2e623b5cfe1e76434ca5f29f`

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