PDF malware analysis — malicious · 36bbf61efdbb6a31

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 20:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 31f252c6239e94ae21634258570505f8 SHA-1: c45f3ef254f1faa316f1758230be03c2da46109b SHA-256: 36bbf61efdbb6a31b5809fd2656b315775b183121cdd480ab061a36feea945a6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous external URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The file's structure and URL distribution align with a malicious link distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9931

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://qpshouse.com/upload/image/file/lujazavarujejezir.pdf In PDF document text
- http://ahxxzx.com/userfiles/202107/file/dadakose.pdfIn PDF document text
- http://kino-cosmic.ru/sadm_files/58669201615.pdfIn PDF document text
- https://icon-studios.com/userfiles/file/bexidarix.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66792315f---vodozapirevezut.pdfIn PDF document text
- https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f43ec7fe2f5d28255add986a3956ae41/nogoraxasopekenubere.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc701ab66---jelopupepirukebelepulod.pdfIn PDF document text
- https://cytairtool.com/test/userfiles/file/20210721_0e1f0.pdfIn PDF document text
- http://al-farh-iq.com/upload/userfiles/file/fokosiridu.pdfIn PDF document text
- http://majstrissmt.eu/www-data/file/17020133778.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4327b0831---wefakijirixorufukisib.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0972c55c0d---5712511555.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113ab8e2306f---44168612934.pdfIn PDF document text
- http://hdurmuslar.com/images_upload/files/40596049825.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/050d4b178365d9219743119a78dad702/xinolakijug.pdfIn PDF document text
- http://tokyoto.pl/UserFiles/file/bovefatamabi.pdfIn PDF document text
- https://smartbrand.ro/mm/file/80383759528.pdfIn PDF document text
- http://amandamaitland.com/images/file/16248942865.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161299e07e1288---kubexovolaxiketamoxoxegop.pdfIn PDF document text
- https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/fagabuluba.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/pfvh7ptcpqu7r8vqb5vavo1562/87308581300.pdfIn PDF document text
- https://aadharshilaschool.org/userfiles/file/pagofiderozepapeso.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=meteor+shower+coralPDF link annotation
- 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_off0000ca68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA68	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e27a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE27A	16872 bytes
SHA-256: `9a4acb34b0ab4180592d2e835f98a850790f414c187f62e11fe576ea40ddd00d`
`font_02_sfnt_off00010e01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E01	10208 bytes
SHA-256: `6a91fc83e62401eb9c7247df9caebb193025cb620f56f51e3216a7eb79cfc7a3`

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