PDF malware analysis — malicious · 68c5850a0afe2123

MALICIOUS

PDF

78.3 KB Created: 2021-09-10 23:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 211b2f199e3ff4ea9bb09ae236848e14 SHA-1: 4cf0a0af5eead4ee2739b39f160ad01e22ac534f SHA-256: 68c5850a0afe21235c43ca7da6cada17bf7931da47c017fbbb67e8da1f28dba0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to potentially harmful destinations.

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://minhgianggroup.vn/upload/files/sotaxifikolorobun.pdf In PDF document text
- http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/34398940508.pdfIn PDF document text
- http://ediliziaunoaventi.com/userfiles/files/xowebikik.pdfIn PDF document text
- https://ipssecurityconsultants.com/ckfinder/userfiles/files/woliwofutit.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366586d9a54---narorijil.pdfIn PDF document text
- http://frutapac.es/ckfinder/userfiles/files/22384889456.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/25ff5d2e7577d48c9f89bacede01a488/74825271573.pdfIn PDF document text
- http://aodaiminhhanh.com/app/webroot/uploads/files/78940108847.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mu7ejs1vgbra9res3h5mu3kri1/vuvedovodulune.pdfIn PDF document text
- https://hchoanglong.vn/userfiles/file/66698344020.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397ecfca148---39459676728.pdfIn PDF document text
- http://tranindo.com/Uploads/userfiles/files/wijizusovusukowajobenafo.pdfIn PDF document text
- http://aranysolyomfeszke.hu/editor_up/begezap.pdfIn PDF document text
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f4682e4b7932d176bee55207f75d189f/gademuvasonudopeg.pdfIn PDF document text
- https://vilnius.cvzona.lt/resources/img/files/vexugeruvunid.pdfIn PDF document text
- https://bikeid.net/ckfinder/userfiles/files/32800110634.pdfIn PDF document text
- http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/pozamudemugujozigule.pdfIn PDF document text
- https://espiber.cl/images/uploadedimages/file/dopewepujixekebamiv.pdfIn PDF document text
- https://okud-istra.hr/userfiles/file/disepezogiwokanodopixe.pdfIn PDF document text
- http://gpszone.hu/upload/userfiles/file/wilewolulij.pdfIn PDF document text
- http://vangphutai.com/images/uploads/files/botus.pdfIn PDF document text
- http://ecole.ru/text/images/file/xemimeruxefidupel.pdfIn PDF document text
- http://villaelen.it/userfiles/files/dajujudamepegazovukipidij.pdfIn PDF document text
- https://dpt-mh.com/uploads/news/files/reboresituzuwiridexofu.pdfIn PDF document text
- https://exlite.it/ckfinder/userfiles/files/60310304774.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=telecharger+vanced+managerPDF 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_off0000cc84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC84	18324 bytes
SHA-256: `babd95be3c2b060cc0aca5cb7128e5857642802bc476d8482c00b6070cfd7a7f`
`font_01_sfnt_off0000fc8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC8C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000114a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114A3	10368 bytes
SHA-256: `c4bba5da45c9669101dbe1db8a2ab53c48cc1cef1e9b3774863f0fae392a30a1`

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