PDF malware analysis — malicious · 5fc27a5bafe3e6ed

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 03:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1ddb4bf876fb3518a19752bdec2c129c SHA-1: a0b27490052c285ae7444d774b5b127419304307 SHA-256: 5fc27a5bafe3e6ed9efbaa36552bef3abccae37b7d207bdf3975a14216a5080f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites and disposable hosting. The embedded URLs and the PDF's structure suggest it is designed to exploit SEO vulnerabilities or serve as a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/18f2273635077e6e2fdb08bbeb252fa4/8623568692.pdf In PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd500fc55---jotumipifaxoru.pdfIn PDF document text
- https://binarbaidfabrication.com/public_html/userfiles/file/94080236948.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/25f0c464888f76240486459a6a82766c/gisejupotikajopirefufaz.pdfIn PDF document text
- http://st-communications.com/ckfinder/userfiles/files/66242437640.pdfIn PDF document text
- http://altinay-law.com/images/file/viwapegosejutopas.pdfIn PDF document text
- http://soluzionebenessere.eu/userfiles/files/24804372267.pdfIn PDF document text
- http://etpatatietpatata.com/userfiles/files/61276594823.pdfIn PDF document text
- http://splogservice.ru/content/files/rasena.pdfIn PDF document text
- https://tkquiz.com/userfiles/file/47419781059.pdfIn PDF document text
- http://autoscuolapezzano.it/userfiles/files/72697295954.pdfIn PDF document text
- http://pospatrans.cz/UserFiles/File/nopol.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099fb21f022e---verimuwekekafixetaxukelu.pdfIn PDF document text
- http://computer-rudolstadt.de/upload/file/gopigivesamiloderubimi.pdfIn PDF document text
- http://giprozdraw.ru/ckfinder/userfiles/files/wokikanoxirenu.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22f7c8337---30270621904.pdfIn PDF document text
- http://szzxwx.com/Upload/Upload/file/2021728923549961.pdfIn PDF document text
- http://ccsilver.kr/files/fckeditor/file/17345066006117cb176e84e.pdfIn PDF document text
- https://ckmusicdesign.nl/userfiles/file/xefebofokubapu.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7e2e5c0b80ad7a7f0839c8d07efeff9a/fuvogakubudodiwebibutu.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/697651fad9ddebaab8679c4283091d9b/kesewanodudebewonasewejef.pdfIn PDF document text
- https://lose-weight.tw/upload/files/8227597832.pdfIn PDF document text
- https://daiichigroup.net/uploads/news_file/2593334340.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8f169cad---27520928646.pdfIn PDF document text
- http://strategie-online.net/catalogue_dynamique/file/gokulomamuvadimexoja.pdfIn PDF document text
- https://impactmediaresources.com/userfiles/file/18894153539.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=examenes+b2+cambridge+pdf+con+solucionesPDF 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_off0000e043.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE043	17608 bytes
SHA-256: `d861039d5abf5188c2336c2a74829942c56a6c758327592dfe977c917b44c67e`
`font_01_sfnt_off00010d72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D72	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012589.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12589	11308 bytes
SHA-256: `355c669cfa2b76190297994ee18dbbf3f85fb96a1a026233086bfc7fca1c3b86`

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