PDF malware analysis — malicious · 496837aabaf91455

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 13:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: a554a67973bdcd311d110fd9604f615f SHA-1: bcfe0851d8f477c50a24fb14d9252f57bcefca1f SHA-256: 496837aabaf91455e331cf57987de02bdebd4d02ad86587b2358bca8984c1a53

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

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://queure.ru/uplcv?utm_term=blueant+q3i+manual PDF link annotation
- http://aviapartner.biz/js/ckfinder/userfiles/files/35521813604.pdfIn PDF document text
- http://lorofilmes.com/Uploads/ckfinder/userfiles/files/61142410544.pdfIn PDF document text
- http://stphilomenaonline.org/userfiles/file/kiribefopanafadujobowe.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/63978284597.pdfIn PDF document text
- http://www.benyowsky.com/resources/files/50818369336.pdfIn PDF document text
- https://matteagianotti.ch/userfiles/files/22836220968.pdfIn PDF document text
- http://kcntanduc.vn/img_duhoc/files/novoxerurojenefovirufi.pdfIn PDF document text
- http://thenext.pk/userfiles/files/8521171382.pdfIn PDF document text
- http://cyuansheng.com/userfiles/file/47233494985.pdfIn PDF document text
- https://palezieux.com/ckfinder/userfiles/files/74704277282.pdfIn PDF document text
- https://cmfnepal.org/userfiles/files/mudaxowoxiwuw.pdfIn PDF document text
- http://www.espace-hotelier.com/ckfinder/userfiles/files/65308889406.pdfIn PDF document text
- http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/4761714757.pdfIn PDF document text
- https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/vapaxodudu.pdfIn PDF document text
- https://ximangcampha.vn/upload/files/20713837251.pdfIn PDF document text
- https://kitapkaplama.com/upload/ckfinder/files/rawepefisuzuli.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161341d931b083---67193462287.pdfIn PDF document text
- http://highspiritsmusic.com/ckfinder/userfiles/files/zimipesovulejofuripaf.pdfIn PDF document text
- http://imhyuk.com/imhyukeditor/userfile/file/35120127873.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138741c25eee---4847027094.pdfIn PDF document text
- http://n2nlah.org/UserFiles/file/jupumikekuzonixuvupif.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161313e5c0fe06---11356638020.pdfIn PDF document text
- https://marupyara.com/fotos/userfiles/file/pifubolotolunanonefeti.pdfIn PDF document text
- http://eiak.org/upload/editor/files/dezapekulamolu.pdfIn PDF document text
- https://pioneerlift.com/upfiles/editor/files/kuremoletoxefi.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_off0000be0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d625.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD625	10352 bytes
SHA-256: `455423e6a4a62b5fe7ef1ed969a0200e95ca513493a19a3a34bc39527957817e`
`font_02_sfnt_off0000ed7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED7B	16860 bytes
SHA-256: `ab627df176f2f25fd4ecf3627c525c68cb7e28e796cd6e72ad30ac6bb087ba8b`

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