PDF malware analysis — malicious · 39ded9ac8c6bea99

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 14:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 536a3fc22bcaa5057c18ace5b824c8a5 SHA-1: 34790d940a393c4a53b75b5335197d9e9d791b7f SHA-256: 39ded9ac8c6bea99f2fcb5645c65d9a3dc87e71913f4d85f6f5d30986f4e3b2d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of disposable hosting indicate a campaign focused on SEO poisoning or distributing malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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 https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071004a7ddf6---tazirepuriwapesagilozumu.pdf In PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a256fc8a656---ziridewiwirerovoz.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4f50d48de476f321b193ae4ca1becc54/43480523606.pdfIn PDF document text
- https://goooinggroup.com/userfiles/files/20210624_162645.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ri9e2hj24dkr58n6mu2fms38t6/suwevovuviraxorililonil.pdfIn PDF document text
- http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e8fafbd0b98b3b76c07e31977fba3067/toxuribufuluw.pdfIn PDF document text
- http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ada0e4927---jutegiziluzokexekofos.pdfIn PDF document text
- http://goteneplast.se/files/images/file/gizerutuzaka.pdfIn PDF document text
- http://residenzaeden-albisola.com/userfiles/files/tajagubasugurutasuv.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/132eau788nt631snh1p7v4mut2/dakuxaretad.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/638f8ee880d92e57b10b6879e28529ea/71345668899.pdfIn PDF document text
- https://nacionalequipamentos.com/ckeditor/uploads/files/21395841060.pdfIn PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a9a9e3759e689cf565f673adc9123000/tirazoxapunawagebojuj.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/44838963728.pdfIn PDF document text
- http://droprint.my/home/ququ4923/public_html/userfiles/file/bedijepimirediko.pdfIn PDF document text
- http://maychaybocaocap.com/app/webroot/uploads/files/nunibadubud.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0ebd8bf0---45880952853.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/wudixik.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cfvp9ee007d5p9j9nt787ongt1/90129790757.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/tefagivuvasawanalafa.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1ab0b1257b5ec0646819a5f6bc83ef88/dofegezepatetafiseruje.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082b840e0dbf---jokitodol.pdfIn PDF document text
- http://mtecommerce.it/public/news/file/konobomafawudigo.pdfIn PDF document text
- http://delannahotel.com/user_img/file/sekututisegu.pdfIn PDF document text
- http://www.pranabkumar.com/fckimages/file/9022619489.pdfIn PDF document text
- https://charlesstreetvideo.com/userfiles/file/48758457770.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=franks+to+dollarsPDF 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_off0000f28f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF28F	10088 bytes
SHA-256: `692d078b6249799e26a9467713b69be6a32bcbde4c30c10fa7a4da672dcd6e76`
`font_01_sfnt_off00010921.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10921	16816 bytes
SHA-256: `f264104db583fe80773a4e2803f7234448499e70059a11a645bd69decf4de1f0`
`font_02_sfnt_off000134d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134D6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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