PDF malware analysis — malicious · f5ff1dda95c8501f

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 22:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 7912d19047a5d2de5bf89176a9486ca5 SHA-1: 09929de11efdfb0395e094c98e19bfad60af01e8 SHA-256: f5ff1dda95c8501f16a429703c9db30c31868b93eddbd66c6c8dd88c2c8c5a0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary attack pattern appears to be directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=anorexie+et+boulimie+pdf PDF link annotation
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cf76afb7720f25e6aea28767ea46ae99/kemimit.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098820d05c85---57089674211.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a34fce7c056---26274088411.pdfIn PDF document text
- https://multimetrics.com/ckfinder/userfiles/files/44857292508.pdfIn PDF document text
- https://kiameds.com/images/upload/files/937481578.pdfIn PDF document text
- http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608528e12828a---sizuzir.pdfIn PDF document text
- http://leoclubmarsala.it/userfiles/files/depopab.pdfIn PDF document text
- https://thietkevuphong.com/uploads/image/files/8333313443.pdfIn PDF document text
- https://tootooair.com/FileData/ckfinder/files/20210706_8A01DB95E373425B.pdfIn PDF document text
- https://sabagdasarov.ru/upload/file/32129026757.pdfIn PDF document text
- https://clubsportedinburgh.org/userfiles/files/18625447750.pdfIn PDF document text
- http://strap.sk/uploads/files/budikojulax.pdfIn PDF document text
- https://holyfamilyhospitals.com/ckfinder/userfiles/files/41113102342.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/35096034745.pdfIn PDF document text
- http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kejeluwobowefodekif.pdfIn PDF document text
- http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/18978551452.pdfIn PDF document text
- https://istanbulbalbir.com/upload/ckfinder/files/nutovosidevuxavesot.pdfIn PDF document text
- http://pjteam.hu/uploads/29534845558.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2958adcd---sefuwazukadudaribenivuz.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/92057423921.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e19e5a655---48626943280.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/897e9d6f73df48e772c8c9c37d12dacc/vubaguveramufeg.pdfIn PDF document text
- http://littlepearlspublishing.in/data/eimages/file/61451582003.pdfIn PDF document text
- https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vtkr30ffbho55v5jekc7b0778a/50590263122.pdfIn PDF document text
- http://gps-tw.com/CKEdit/upload/files/61711685153.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_off0000ce23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE23	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e63a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE63A	10652 bytes
SHA-256: `e2f68851c839c89770de5214fdaf0f99ca37b07989a94010b4daba9f79f314a6`
`font_02_sfnt_off0000fe52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE52	20076 bytes
SHA-256: `5cdb5b54e52c2659fd737ed8a6d6bbc223c23c748523f3f0f0d8be8dbbc0d821`

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