PDF malware analysis — malicious · 7b6ff1c37e3c5301

MALICIOUS

PDF

88.8 KB Created: 2021-07-06 10:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 06aadcb8774c47948b6847c7dd5ca477 SHA-1: 085c44e5b4dd0230c0042617ccb506d4101f1058 SHA-256: 7b6ff1c37e3c5301845b63d9cbd9012b114cb69920b1cf779af5889568494f78

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The PDF structure and embedded URIs suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=ragdoll+cat+grey+and+white PDF link annotation
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1bc2dfca7---zugegumegukudotid.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/qe4d1rktannbac0gqneppfenk7/40740768147.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a52ace93007---lifuxu.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be0735771---52231602234.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/witiramixosebaleg.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609229922ad7e---52611496233.pdfIn PDF document text
- http://webinaris.biz/ckfinder/userfiles/publics/files/54514914708.pdfIn PDF document text
- https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/t1e1mppq21fs8bt3ihrct3oh0s/74349020679.pdfIn PDF document text
- http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebuvewugotopanadukoxe.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080378e8e41a---vupobu.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fd493d4b965cfc8d668c3f61851ae91c/sobigutafu.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/niiunnsfsn38q5m1svdhshoa1m/85300552672.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8f411826144aa6a3430b15c936b6b5d5/90598590976.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a788d33f---59327904540.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079375ddc8c1---bisosove.pdfIn PDF document text
- https://susta.vn/userfiles/file/jolezogupobuwulosomodex.pdfIn PDF document text
- http://nw-line.ru/generic/uploaded/defilexutalere.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b57210db50c095645730ce0b7784fa8c/41962147674.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/fdeafa8ed4fc472f0bd6deeb3fa54450/64250513681.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984328779b9---94213077391.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/67080170865.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d416c48cca9b5fd0051ba11d659ab78d/danepujulumikamaririxafi.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/bazoguxu.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799625d64a6---56375286290.pdfIn PDF document text
- https://mebelihome.ru/upload_picture/30825829751.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_off0000f7da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7DA	10724 bytes
SHA-256: `3fb20010237ab5d71b9f766520e9343fe448d6e97bc240c42cb0f06642afeb86`
`font_01_sfnt_off0001103b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1103B	17464 bytes
SHA-256: `2e316c97ae228003406473a17fb7ea1e05c2aa8096479a100dc058847d98a788`
`font_02_sfnt_off00013dfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DFC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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