PDF malware analysis — malicious · 4b7a1e11b0b708af

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 18:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 1ee7d1d9d44f53886212d913ed5e3e87 SHA-1: dccd5627a8f2e47644ec8ccc8e0391da10155a3f SHA-256: 4b7a1e11b0b708af5c51e0f8fa0bd82fa74114f016240ef01f9b4f4a5ce93e55

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://www.asoriofrio.org/ckfinder/userfiles/files/ditawudozuxitedi.pdf In PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614095726a2ab---zijunaramemibafutijasafo.pdfIn PDF document text
- https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/58988888269.pdfIn PDF document text
- http://ongxoanhdpe.vn/upload/files/xulido.pdfIn PDF document text
- http://dongshengcable.com/images/upload/File/50800822139.pdfIn PDF document text
- http://topstec.com/d/files/xipodukuvakumuvob.pdfIn PDF document text
- https://giridhareye.org/ckfinder/userfiles/files/fesinen.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f883abce54377ec19e844b358197ba9/43258978994.pdfIn PDF document text
- http://fuerst-architects.com/uploads/file/94980236963.pdfIn PDF document text
- https://dunakanyarfesto.hu/ckfinder/userfiles/files/7194553847.pdfIn PDF document text
- http://kvarkeno56.ru/userfiles/file/8857901363.pdfIn PDF document text
- http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/29277075110.pdfIn PDF document text
- http://pinzimoniofiumicino.eu/userfiles/files/giwisor.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317ee88d49a---12427261125.pdfIn PDF document text
- http://cokhitienvuong.com/uploads/files/76811579996.pdfIn PDF document text
- https://florerialafloresta.com/ckfinder/userfiles/files/fivex.pdfIn PDF document text
- https://hattshopping.com/admin/assets/images/ckfiles/safagilapejinudexutiwimor.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/zufalavibal.pdfIn PDF document text
- http://jainfarms.com/uploads/68363284456.pdfIn PDF document text
- http://vevo.keresztessyoptika.hu/elemek/file/96843309454.pdfIn PDF document text
- http://1careglobal.com/upload/files/35574796063.pdfIn PDF document text
- http://twtipa.com/upfile/files/2021/09/07/zukupetijinavefutudebiwi.pdfIn PDF document text
- https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/topevepisemivitexagebo.pdfIn PDF document text
- http://amunt.madteam.net/ckfinder/userfiles/files/33529319249.pdfIn PDF document text
- http://innotack.com/userfiles/files/47899128496.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398fe3cf048---rapabukebedepafis.pdfIn PDF document text
- http://373113.linker.tw/files/xufixibigutefobavuxuvev.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=financial+%26+managerial+accounting+free+pdfPDF 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_off0000d614.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD614	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE2A	9576 bytes
SHA-256: `d52e43a56cdeb94f1fe1e0064a44b6fff47dcdc83dfc48e5b4651fc8259616d2`
`font_02_sfnt_off000102c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102C8	16688 bytes
SHA-256: `34d09647e991ca1d681f8445d1aade1cc4a1fc6f378d1349f6cc80ed0c341935`

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