PDF malware analysis — malicious · 6fb90d3b50f18e43

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 01:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: ca271692cfffa6b18e82ce0f7a0c00b5 SHA-1: 45361d5717fb5eb9c9868d6f991d836b880ec98f SHA-256: 6fb90d3b50f18e43719be482b2571dad087b5a80080bb592c704b0a4d33a5c06

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF acts as a link farm, likely intended to lure users to phishing sites or download further malware. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 5

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://coretry.ru/uplcv?utm_term=pairing+apple+watch+manually PDF link annotation
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/vi4h6j81u654t596ko81d4r14n/patajedigusofuwapexogevi.pdfIn PDF document text
- https://badrivishal.com/media/23812854558.pdfIn PDF document text
- http://mexvp.com/ckfinder/userfiles/files/51751460833.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed65cb1f95---69012783304.pdfIn PDF document text
- http://paramountswimwear.com/userfiles/files/30399858125.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715b2584e12---28850002153.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d917bfaa---lujaj.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/76ead0b6d50f221b9e735333de46c537/misawapopasigudise.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da170b6723d---latixuvirutivuwu.pdfIn PDF document text
- https://bestrecycledautoparts.net/images_i/file/49805205258.pdfIn PDF document text
- http://longarmquiltacademy.com/fckeditor/userfiles/file/xigavurojukut.pdfIn PDF document text
- http://air-ned.com/uploads/files/91379515784.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb23c4170f---3357080241.pdfIn PDF document text
- http://anhopphat.com/uploads/files/46754405390.pdfIn PDF document text
- https://johanbjerke.se/userfiles/file/43300639741.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kh6qatmgu3ql9h3vn51f1rptu5/92160060066.pdfIn PDF document text
- http://leinerpakgelatine.com/survey/userfiles/files/89146197455.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bcab7eb68871f28281beeea1e8ce87a3/liguzojexi.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/eq2s21iqo1gajl1l87qlkgkat2/95396986443.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16087504f0e745---gulamepele.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee370e84c4---jegad.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378618ce74---29120044823.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_off0000de8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE8D	10836 bytes
SHA-256: `96fc8296c4bcef8a5bdfed3f88bbb904da0e9267f8b9740cc97107492d3a4533`
`font_01_sfnt_off0000f76a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF76A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010f7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F7C	18040 bytes
SHA-256: `ef4439d0550a3b7aeb5184ddfedbf46ee5864ea5452c5f86e86b3e3251e72ec9`

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