PDF malware analysis — malicious · 41c3e0432de35378

MALICIOUS

PDF

76.3 KB Created: 2021-09-27 06:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 3f6b7239b1d000414752d634a2302cda SHA-1: 469d2d3a03f0b19cf88829b78bde0e9dd6df6fe2 SHA-256: 41c3e0432de35378210accee6531bfd743e67ee4b17524eea17ab21f29d8efdf

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=papierkorb+l%C3%B6schen+android PDF link annotation
- https://sakura-bashi.com/uploads/files/202109171458558655.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d24cba17085dd06264775dd919934b27/36466192636.pdfIn PDF document text
- http://tetraeng.it/userfiles/files/30463266766.pdfIn PDF document text
- http://mkconline.com/landmark/ckfinder/userfiles/files/70623960191.pdfIn PDF document text
- https://www.aledrukujemy.pl/ckfinder/userfiles/files/92900710142.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb74c8c62---81691050007.pdfIn PDF document text
- https://smwebtechnology.com/arishayurveda.com/userfiles/file/xabosafapinirusewid.pdfIn PDF document text
- http://web-news.eu/www/pkpar/userfiles/file/94171007496.pdfIn PDF document text
- http://ateliergermain.club/sites/default/files/file/21764264520.pdfIn PDF document text
- http://homeshopeez.com/uploaded_files/userfiles/files/94298019583.pdfIn PDF document text
- http://bosch-elektronarzedzia.pl/catalog/file/zomiwetifilepifebiluj.pdfIn PDF document text
- https://3eyamaichi.com/upload/ckfinder_temp/files/20210924234533.pdfIn PDF document text
- http://franceplus.fr/userfiles/file/fafumubevikixukemawu.pdfIn PDF document text
- https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/giganobulig.pdfIn PDF document text
- http://ellissi.org/userfiles/files/nuwetofiwegurajisisofo.pdfIn PDF document text
- http://allseasonsart.com/uploads/fck_uploads/file/satawamow.pdfIn PDF document text
- https://zzhqhi.com/d/files/75856428699.pdfIn PDF document text
- http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/nonorurufa.pdfIn PDF document text
- https://energooptima.hu/upload/File/lutagepegogubidafe.pdfIn PDF document text
- https://actorconseil.com/files/file/59836258069.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4820a2a6e---8511000938.pdfIn PDF document text
- http://hoteldanang.com/uploads/images/files/vokidozop.pdfIn PDF document text
- https://inprovituruguay.com/ckfinder/userfiles/files/12129120635.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_off0000bf55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF55	18964 bytes
SHA-256: `f53ac58fa9052784d003247e1094089158e0341e86e784701c7aa7d59df79ee5`
`font_01_sfnt_off0000f0d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0D1	10960 bytes
SHA-256: `cc3c31b91235775c389eb7e29f17c6905e8f9ae2b354741c6c979035797a91e5`
`font_02_sfnt_off00010983.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10983	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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