PDF malware analysis — malicious · 8d6a619870725645

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 02:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 169643a83e3779b74e1ff407c2d7c608 SHA-1: 34d53ac467e1b85f87511d66bdf0492cd043c135 SHA-256: 8d6a619870725645e9814bfdb470b77269667d368527b0bc476ab38ed6a347e2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple external URIs and a link farm heuristic confirms the file's purpose is to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://www.recko.ru/ckfinder/userfiles/files/11258446412.pdf In PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60f087d3f69644f8f8428cec7ec65374/60273587256.pdfIn PDF document text
- http://fobas.cz/userfiles/file/nejagunetatu.pdfIn PDF document text
- http://polyalpan.hu/_user/file/68226379266.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cntkhr9bdaqgf64pvbuqj4gb49/22845679794.pdfIn PDF document text
- http://maha.tcnme.com/chop/multimedia/userfiles/file/65335649158.pdfIn PDF document text
- http://impex-italia.it/userfiles/files/70392260492.pdfIn PDF document text
- http://infiniti.e-library.tw/uploads/files/vonuxetoxi.pdfIn PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/tipuwujujimoxa.pdfIn PDF document text
- http://www.impactit.in/ckfinder/userfiles/files/jezatamarap.pdfIn PDF document text
- http://abhinavabhishad.org/userfiles/file/kinixelomivumifavemasolor.pdfIn PDF document text
- http://ambulatorioveterinarioilprato.eu/userfiles/files/lokezif.pdfIn PDF document text
- http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tovinafen.pdfIn PDF document text
- http://archiprojektai.lt/app/webroot/uploads/userfiles/files/nuxapavejemawasexubewezej.pdfIn PDF document text
- http://shrlie.com/upload_fck/file/2021-9-12/20210912015610258508.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/45d84d826ac743c3d5fef561dd744e68/20436296756.pdfIn PDF document text
- https://stdtekstil.com/upload/ckfinder/files/31108656500.pdfIn PDF document text
- http://daimarconstrucciones.com/images/admin/file/kuzakazegomibodukutoge.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210909160747_1107647742.pdfIn PDF document text
- https://balajitutorial.com/admin/userfiles/file/mokaz.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9e99b1e21859176efb532c915ff4e412/32399948007.pdfIn PDF document text
- http://drcleancenter.com/uploads/files/202109160920392330.pdfIn PDF document text
- https://okazdedziecko.pl/_files/Media/file/73469735720.pdfIn PDF document text
- http://giovanninociti.com/userfiles/files/sebidefinufebojomixuta.pdfIn PDF document text
- https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/fisewopis.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=new+gun+collection+valorantPDF 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_off0000b303.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB303	10468 bytes
SHA-256: `5fb41d7f21f1e436f75d8a803da1438f9f5470e8dc0b596ef05d012098f1913b`
`font_01_sfnt_off0000cafb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAFB	15640 bytes
SHA-256: `d84d50d482fe2c1c81881fa82e73d96146b482c0c9fe54e65fd10662db1f3a75`
`font_02_sfnt_off0000f27e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF27E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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