PDF malware analysis — malicious · c26c8763f8ac1da1

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 08:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 51efc39472563e3e6a6f939af13537c9 SHA-1: 4ceef9209efe0c9196a93a5f95b3c18e5c438661 SHA-256: c26c8763f8ac1da1622228e7e6017f74a381902c5b47d3b19c95f57cccedfbfe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver second-stage payloads or redirect to phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=taxi+driver+korean+drama+ep+1 PDF link annotation
- http://jiachuankeji.com/upload_fck/file/2021-9-13/20210913075216668853.pdfIn PDF document text
- https://stcc-sa.com/motakamel/Ups/files/21296281709.pdfIn PDF document text
- https://markiza-trade.ru/admin/ckfinder/userfiles/files/sutelezisarerevum.pdfIn PDF document text
- http://hzqzg.com/d/files/ponujisiv.pdfIn PDF document text
- http://lexuspolymers.com/assets/ckfinder/userfiles/files/laxunezonigotadugove.pdfIn PDF document text
- http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lafukovixabagamufo.pdfIn PDF document text
- http://abwalabamaave.com/uploads/files/5179564237.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f04651b9d---67047361371.pdfIn PDF document text
- http://vtdsbinhthuan.vn/public/uploads/userfiles/file/xisatixotat.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df90d91117---naberevujapebobugofuz.pdfIn PDF document text
- https://tourgardan.com/basefile/tourgardancom/files/butuzebusosuzak.pdfIn PDF document text
- http://www.culturehousesun.org/photos/file/83920310379.pdfIn PDF document text
- http://badischer-kunstverein.de/ckfinder/userfiles/files/73556627521.pdfIn PDF document text
- https://hotelindigha.com/FCKeditor/file/6574544779.pdfIn PDF document text
- http://nscenter.cn/upload/files/73816686265.pdfIn PDF document text
- https://www.hmgfinance.com/ckfinder/userfiles/files/jezobizenivuditejezegob.pdfIn PDF document text
- http://laptopplus.be/app/webroot/files/userfiles/files/mogalijakaxufoge.pdfIn PDF document text
- http://druckmaschinenservice.com/uploads/fce/files/woroziwojilezipopuleto.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/34bf40e509a550ea793f2f0d317f79a9/migafokesiwujizomalufik.pdfIn PDF document text
- http://stellar.ru/ckfinder/userfiles/files/83029291778.pdfIn PDF document text
- http://vinaktv.com/storage/ckfinder/files/dirujatidokanonulixi.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5c3153ea6d4b171d6208f0ec1dc11542/74938069727.pdfIn PDF document text
- https://adasms.fr/userfiles/file/fifela.pdfIn PDF document text
- http://kht.civilkozpont.hu/uploads/file/21396973799.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_off0000b964.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB964	10516 bytes
SHA-256: `a54a1960b7c44f46b246a3c9c7132d8c15d3866c421304e57b1c8cf38643f48d`
`font_01_sfnt_off0000d158.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD158	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e96a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE96A	16008 bytes
SHA-256: `545709a1799476db691592a81a233a4cc1c7829ce5f11aaf8bf867b9e89861e4`

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