PDF malware analysis — malicious · 7e8ccc6324b6bc97

MALICIOUS

PDF

82.0 KB Created: 2021-07-22 02:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 3d4f4d5342163a5ba5365ec3f2d19c9b SHA-1: 77abefc7c7931276e8d9eb577aa29469867e90e9 SHA-256: 7e8ccc6324b6bc97fc1a7bf005501139e9fa9a45035dcbb93032eb673c0491ef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9986

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.
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 http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a6c3a9ee5---zikizevov.pdf In PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbff30c145a---76014190455.pdfIn PDF document text
- http://krakow4you.pl/krakow/files/bijuranadosuwib.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d99ee713374---22876998555.pdfIn PDF document text
- http://nextgt.eu/uploads/file/petirezakimata.pdfIn PDF document text
- https://upbilbao.com/ckfinder/userfiles/files/tukemoxuxajoj.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff8136e77---worigonefilegawavu.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9580dd71ac96e3500f9b1a794cde4ae5/9050069625.pdfIn PDF document text
- http://veraschwemmle.de/fckdata/file/19760379053.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f5a220cb4---lubopimozonuziziwas.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/30b2b8b1dcf04a038f9838d9cb54ac89/dedur.pdfIn PDF document text
- https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/7q8bpbgmbnmmth4maoetasmb76/2824082431.pdfIn PDF document text
- https://chptravel.ir/data/file/rogaxuta.pdfIn PDF document text
- https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/grh9nqe05r0ubgmk8sh3sptb5o/25187163324.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccd3669aae---latofobazepagivuv.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843f1e46d0---3276923823.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f4ec414ae---42198408449.pdfIn PDF document text
- https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/1dlbhmpqrupngqjej94r3mrup8/jifubofotonakijuvejifap.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/37113783098.pdfIn PDF document text
- http://kazuma.ru/ckfinder/userfiles/files/jipuxilevilofuwijef.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9b976b8f---32106342136.pdfIn PDF document text
- https://vegan-eshop.cz/data/file/78293663138.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d8069a70---56596481255.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ohv875a4q9300lefm0bp199frp/85414646659.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e941f44f3ed40c2d03649a9803412a61/vutemuteleluwulum.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=1+cm+to+nmPDF 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_off0000dffb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFFB	17008 bytes
SHA-256: `1a93a6dcfeb145dcb7dd2149fbf5c95d3b5a36b3a6458eff8f4f868e4d6fd12d`
`font_01_sfnt_off00010c90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C90	9648 bytes
SHA-256: `51829203a6f8b0f10cca4da9d779d04852426e1dbec3e3fa5b6a5aadb496ee98`
`font_02_sfnt_off0001217c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1217C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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