PDF malware analysis — malicious · 87a0c980d4b6ad15

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 17:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: cc06b22a8b94090a00d1b01b53e01d86 SHA-1: f460160d0e810a0a1e967c5d4ab00dd300b66a44 SHA-256: 87a0c980d4b6ad15ce42d4a181351f5c88ffe84bdc7bd08d57019378c4f5be27

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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=how+to+train+your+dragon+2+full+movie+online+free PDF link annotation
- http://varanini.pl/userfiles/file/51412882660.pdfIn PDF document text
- http://poiskvod.ru/images/file/7695796401.pdfIn PDF document text
- http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6f42021511369bcebcb8aae2f33d9821/259074579.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592c1d3fe2---fomunikomelutab.pdfIn PDF document text
- https://hiddencliff.kr/FileData/ckfinder/files/20210606_F2B6D32F0DD0C57C.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2086b9fc1d2adecd218cff6b2ec76add/90677212798.pdfIn PDF document text
- https://rts-wm.com/ckfinder/userfiles/files/rivefanigisibikuv.pdfIn PDF document text
- http://www.motocams.cz/ckfinder/userfiles/files/48328205074.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca58a8f11d---gomofogijumar.pdfIn PDF document text
- http://benardoutlite.com/admin/fckeditor/fckdata/file/ginufuzal.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce5ba7ad3---tirobepovonogi.pdfIn PDF document text
- https://rocksoliddesigns.biz/userfiles/file/94327106764.pdfIn PDF document text
- http://logiccpacma.com/ckfinder/userfiles/files/52053709490.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fn70rl9tqdrl1rlsc7t5tj54eq/27894566245.pdfIn PDF document text
- http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/fevevogiwudafibibavudalo.pdfIn PDF document text
- http://ac-kenigsberg.ru/files/file/29627826545.pdfIn PDF document text
- https://leavereview.com/customerinterview/ckfinder/userfiles/files/pudutupoxuluraxu.pdfIn PDF document text
- http://denki-shonan.com/uploadsfile/70184021601.pdfIn PDF document text
- https://cyklo-wellness-penzion-palice.cz/content/kaxakij.pdfIn PDF document text
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5acfd48d4c49e738b7563ba9e661b838/vozijonajetulijugug.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/529182c577db3831b76d296736ac4784/35408096784.pdfIn PDF document text
- https://rsun.pro/admin/ckfinder/userfiles/files/mureb.pdfIn PDF document text
- https://cargobull.cz/res/file/xewemokip.pdfIn PDF document text
- http://canvangdientu.com/images/file/bebekubefu.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b657fb78397---50730396684.pdfIn PDF document text
- https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083daef3a290---87598369917.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160710f111441d---88854445500.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_off0000f041.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF041	17608 bytes
SHA-256: `7b70562e0963c91eb195405ba22b002864635dbd125d003deaa1ad418ad29e78`
`font_01_sfnt_off00011e2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E2E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013645.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13645	11008 bytes
SHA-256: `bc427f69fc264d70478aebb3f06bc6a25858dcdf6680cfd458e391c94be4bd37`

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