PDF malware analysis — malicious · 9271f8f2dde92090

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 19:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 056fdc5b0231702f7f065d85810a16ae SHA-1: c7dbab5eb4f534ef08efacaaea563620bd79e510 SHA-256: 9271f8f2dde920903a904adfc6416775ada66c8a62e5c3bd3f2e5f7f2787b7d3

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, often low-reputation hosts, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of embedded JavaScript, combined with the link farm, strongly suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=white+pages+switzerland PDF link annotation
- http://werder-ritter.de/UserFiles/File/diremarasalafodasebeko.pdfIn PDF document text
- http://blessingsngo.in/userfiles/files/52593619897.pdfIn PDF document text
- http://www.gpkoaee.ru/ckfinder/userfiles/files/92817234327.pdfIn PDF document text
- https://zlataraburmevuckovic.com/files/42113123085.pdfIn PDF document text
- http://logo4you.dk/userfiles/file/jilidejiwuravane.pdfIn PDF document text
- http://www.valaisconsulting.ch/file/24329242114.pdfIn PDF document text
- http://fujiya-burbank.com/uploads/files/41048927911.pdfIn PDF document text
- https://samsungklima.net/upload/ckfinder/files/likedopi.pdfIn PDF document text
- http://villahetzwartepaard.nl/survey/userfiles/files/bupeta.pdfIn PDF document text
- http://noithatdangcap.vn/app/webroot/uploads/files/lumesojusa.pdfIn PDF document text
- http://paintmaster.hu/js/ckfinder/userfiles/files/loresuraxora.pdfIn PDF document text
- http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89e29c925---54545762789.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131749a42238---86297783016.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bf1a7f743b93a54a4016db543660a92/35441836196.pdfIn PDF document text
- http://sanyosushiglendora.com/uploads/files/32977499227.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd6fdbabc---4840878609.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012cd46973---82026089443.pdfIn PDF document text
- https://allmassage.net/upload/file/20210910230429.pdfIn PDF document text
- http://ozdesignhouse.com/app/webroot/uploads/files/xiferi.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05a2e1399---lifisedakareg.pdfIn PDF document text
- http://dulichtantai.com/files/uploaded/files/30587233229.pdfIn PDF document text
- https://permargi.com/files/galeria/files/72520179542.pdfIn PDF document text
- http://maristaslardero.es/userfiles/file/6302284371.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_off0000cdfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDFC	10688 bytes
SHA-256: `2a5a04c1347b1b803d613b8199abee74159ec27c0a5e2fbc664da46fef7a9600`
`font_01_sfnt_off0000e652.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE652	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fe64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE64	19024 bytes
SHA-256: `74a2f34ca4a0e297c015a97a3674dd38ce1d817d2cff8d1e1350f1abb7b9347a`

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