PDF malware analysis — malicious · a231e086d2d292ad

MALICIOUS

PDF

75.4 KB Created: 2021-06-26 01:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: c9ae0e230823e001e01d1248e198345d SHA-1: 4ebd975f482a55773ed6dbbcd99857e4a0eb1a08 SHA-256: a231e086d2d292ad88a7cd802cf55134a4d66916d4e97f976d0ff02fc6948c3e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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=somebody+gonna+roll+me PDF link annotation
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6321fbd9e9b094ea58c27fa2ef57c040/15224534611.pdfIn PDF document text
- http://vejwun.cz/images/gonilesokij.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/56d9b0c604550691d07ad0aae75f54d7/rurararulujesakiru.pdfIn PDF document text
- https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1cgs3e6ucpu15s4rtdd4m045ll/25333301352.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/70898fd06f65287a57e28d23ce4f54ce/wuregazebemajimafifo.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8a4bd145---9819936351.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607212ba29280---dotopisinuka.pdfIn PDF document text
- http://furniture83.com/upload/files/93950479739.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d311eb4c12---57263270880.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4bfe97ce---88213454124.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/46f132bfab70d259e63cd2366d84a9ca/87439755850.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/536e3831dce167c51bc5e4b2212e90c3/pefasezelulezifebiwikod.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/vn2pkevhh8ctv6ot27t11kubj7/xewoveviwapemuxaxila.pdfIn PDF document text
- https://unosms.us/userfiles/file/3145278943.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2e13f409---xujojuzotusu.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/10cf62b41a293bb4f7d3a372744fb1a9/zuzewigopukugejif.pdfIn PDF document text
- http://lyshiying.com/d/files/89241990850.pdfIn PDF document text
- http://www.anclupnapoli.it/userfiles/file/divelanixiratuk.pdfIn PDF document text
- http://www.asslar.de/downloads/kupimekefodej.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13943f82985493e9e26ea18d0dca5129/49961821252.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d95fbe1e5cd6e42922b698a3a2fee942/beramexumepujiwunirozu.pdfIn PDF document text
- http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/nikikukis.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb24d0310---51525087897.pdfIn PDF document text
- https://burgaseguros.com/userfiles/file/9841944696.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_off0000c20b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC20B	16972 bytes
SHA-256: `cf2d6e60c4c6781e61989cfa727e4bd6c0b733ee27977c55f91831a7ef02eced`
`font_01_sfnt_off0000eea6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA6	10564 bytes
SHA-256: `b695d23d0b5ca9413531901889ecee3787f46d2d5aac0ddd601afe17234d27e4`
`font_02_sfnt_off00010688.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10688	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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