PDF malware analysis — malicious · b38c6a0e859b2f89

MALICIOUS

PDF

88.7 KB Created: 2021-07-31 08:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 767f395f9512932713360cb06d79a53b SHA-1: 6eaec42b6b243bdec695a79592f12d16194bbeac SHA-256: b38c6a0e859b2f896f3ac4ba7f5aef75cdd6c668b27b9ff876c1e420485b2f71

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits PDF vulnerabilities. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of external URI heuristics and link farm indicators strongly supports a malicious intent to redirect users to potentially harmful sites.

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://smidgel.ru/uplcv?utm_term=gta+vice+city+cheats+free+download+full+version+for+pc+windows+8 PDF link annotation
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/on9aue6esa3tfp8u38rj8jcr66/27803807671.pdfIn PDF document text
- https://chp-travel.ir/data/file/wafitakudunuxebewo.pdfIn PDF document text
- https://an-professional.ru/img/files/file/63913948727.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d897d4f486bd0186134ecc6fb80e97b0/vabut.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed93b76471---42900668633.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cffd13b68204c72b70061aa857f8682b/66850444595.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cfa71482---70002642853.pdfIn PDF document text
- http://msiutilities.biz/documents/nefewesisegasol.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dad1e384f---64108941632.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5e0204f8---37812875449.pdfIn PDF document text
- http://bycongroup.com/UserFiles/file/885282934.pdfIn PDF document text
- http://strahovka66.ru/userfiles/file/vexunidopew.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/sedinu.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf38304472---4428858342.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/25b1d0761ccc5b06a7c1d607db57314f/tebotugabejifa.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3ddec8cb---86124949647.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abee4e5d89---gafegirikoturavidi.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a897b1d3616---punojolorejevobuzujolij.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7c0c2f5d104107b10aa92f91043a26a7/92453845213.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a480fbc182a---60633217154.pdfIn PDF document text
- http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/71125503335.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc1365398---48281831530.pdfIn PDF document text
- http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/12160494643.pdfIn PDF document text
- https://abhimaninteriors.com/ckfinder/userfiles/files/nupitubopeg.pdfIn PDF document text
- http://domingo.hu/ckfinder/userfiles/files/xerukepelabit.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_off0000f4c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010cdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CDC	11332 bytes
SHA-256: `693407b3b53e4305e30b7e881b57f085cf47b3d34e82dde2c4ccd636ec206616`
`font_02_sfnt_off00012791.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12791	17384 bytes
SHA-256: `fc85095d04b99b5b35df407bbaff29247f0d636d9e63fc0720f963920df669d3`

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