PDF malware analysis — malicious · 8975693a1d42e52a

MALICIOUS

PDF

94.3 KB Created: 2021-07-09 13:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: f538ddd6ab6731fcfe846c75ea4281cc SHA-1: d6c3ae7ea3188a55779c1be0bbb68eb170a9483e SHA-256: 8975693a1d42e52a86ead6908e27e0c8b58b55a197c8a3cf106c57930e676bd1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content on external sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

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=really+hard+and+funny+riddles+with+answers PDF link annotation
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5fj317ku6q8l7alldfkhcjcusf/20644045060.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9a0d0944---23751268903.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930b2e06a45---31458389997.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/4a2d2ec68cdd2c2f0f56a6fa0fb77cc3/65215891802.pdfIn PDF document text
- http://ubestsports.com/imager/files/20210626131440.pdfIn PDF document text
- https://hanurichurch.org/ckfinder/userfiles/files/78955554129.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ngdamofj2pea2jh0o7go1rg8q2/65500613064.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9d5e209c6843908330a4c7eaf0d2e6ae/16925281959.pdfIn PDF document text
- http://ndt-tl.ru/upload/file/tepefavom.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/8052dea1e35230982cf92271f57a0f7d/kivazosisiw.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/28373515802.pdfIn PDF document text
- http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/48343963410.pdfIn PDF document text
- https://www.greenlakecruises.com/ckfinder/userfiles/files/beviloxirinuxuzajigabanos.pdfIn PDF document text
- http://iltorg.ru/upload/file/33508479919.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6a3c136e---4648116232.pdfIn PDF document text
- https://geniodelweb.com/file/zumedativogamarakowa.pdfIn PDF document text
- https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0f3c8559---jojimelu.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa137079f8---gomexonebufisaro.pdfIn PDF document text
- http://namthangbasaltstone.com/uploads/image/files/51400354892.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beaa30053b---mujigugibofikudurub.pdfIn PDF document text
- http://fairmonteast1969.com/clients/876766/File/32068795711.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9564debdc8e0286293b83169c0d0381c/77571840103.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/21839c83fb47a3e3706755580849cf52/11645897328.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0384a70fe---52412987591.pdfIn PDF document text
- https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d42b359c1d896bd971365035a79ca215/kasararor.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160acd85d4d91a---kudulinedemepotas.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_off00010cf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CF0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012507.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12507	10676 bytes
SHA-256: `55c296165553d8f336c030878b5c9c43fbc211452c26feef12ece4da3dde5669`
`font_02_sfnt_off00013d78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D78	17560 bytes
SHA-256: `5652ed300ec666e41455827339733e183f849332293a0836eae869be67df0590`

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