PDF malware analysis — malicious · b809f582a8e83424

MALICIOUS

PDF

85.3 KB Created: 2021-10-07 12:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 177d31b65b9ec10a16149a9ef7db2870 SHA-1: 673d49a0869bab48fe244331bd97767c8f4c85b3 SHA-256: b809f582a8e83424e3f1c10f4931ca3fd7336f6b66d369539a87b5648bd98157

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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
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://medvor.ru/uplcv?utm_term=their+eyes+were+watching+god+summary+chapter+13 PDF link annotation
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460ae422a37---27241241965.pdfIn PDF document text
- http://ucg-eg.com/userfiles/file/xurodoxuguzowid.pdfIn PDF document text
- http://sga.cc/uploadfile/file///2021092105325640.pdfIn PDF document text
- http://kolbiko.com/images/uploads/file/87025747653.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/97401091265.pdfIn PDF document text
- http://baovekhucongnghiep.com/upload/files/nelatejavazeb.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442373ef697---dimuvixi.pdfIn PDF document text
- http://anquocrealty.com/uploads/image/files/gevupesedewetuk.pdfIn PDF document text
- http://orlickachata.cz/files/files/58312642886.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e28e49592d---jokogigikosubo.pdfIn PDF document text
- http://hoaisonland.vn/upload/files/dimutiwarebifaza.pdfIn PDF document text
- https://matfplayer.com/calisma2/files/uploads/37240106149.pdfIn PDF document text
- http://thegoshow.net/userfiles/file/99603488843.pdfIn PDF document text
- https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/lurupivenivajuvanug.pdfIn PDF document text
- https://bloc-immo.com/images/juwotowixu.pdfIn PDF document text
- http://www.niceresidence.net/image/upload/File/17294743804.pdfIn PDF document text
- https://sistemkabin.com/ckfinder/userfiles/files/bepofudimubukomuremajus.pdfIn PDF document text
- http://autoscuolavalerio.it/userfiles/files/52018393621.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_off0000e560.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE560	18456 bytes
SHA-256: `55ca348e10fdf762fea1820830a3f4cb551d15d96883711498e2937a09121c2b`
`font_01_sfnt_off0001152d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1152D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012d44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D44	11404 bytes
SHA-256: `0071103c69f978b972e916ed80632d1788a3535e5ca58d0eb93896c6b0c5676a`

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