PDF malware analysis — malicious · a494bcccec9b37f4

MALICIOUS

PDF

96.7 KB Created: 2021-08-12 10:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 8e50f71a8e1b9a3a6551c7de76b22167 SHA-1: 030e7d0cd0b7cfbfdc05cbc298ca46f368ebf2ae SHA-256: a494bcccec9b37f472a575e878ba277fde6a590885eb84b520a732373b3c8ec0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9653

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://chcial.ru/uplcv?utm_term=ejercicios+de+tablas+de+multiplicar+para+ni%C3%B1os+de+primaria+pdf PDF link annotation
- https://atlastoursntravels.com/userfiles/file/53644194999.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e761fa349f3153c6453314f050650b9b/99965319547.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a225d28a9b4---datomamugifozukuzudoxi.pdfIn PDF document text
- http://kstarsmall.net/userfiles/file///25116233727.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5df6n0nc8cq43ao1i1msk63e3s/temadelome.pdfIn PDF document text
- https://dineflon.com//files/42901171498.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f3765dfbff3d70a3ac4b91522472bbdb/tiruzevofo.pdfIn PDF document text
- http://htwy.com/upload/file/9225006614.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/02643a5e08e07056aeee4560e41f07f9/8399532151.pdfIn PDF document text
- http://www.deep2001.com/images/library/File/79046473041.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1kg9rc1r8sn7qo4u6uujb5v5s4/xagis.pdfIn PDF document text
- https://tvmreza.tv/ckfinder/userfiles/files/44804648715.pdfIn PDF document text
- http://envigest.cz/upload/file/gikeko.pdfIn PDF document text
- http://ersatzmonitor.de/userfiles/file/28682018405.pdfIn PDF document text
- https://daaeportrett.no/upload/file/vinebejipigogo.pdfIn PDF document text
- https://bahispesinde.com/gnc/veri/_files/vilasenegepezanuri.pdfIn PDF document text
- http://www.naraihillgolf.com/admin/userfiles/file/43920699908.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078179cdc4d5---61514427658.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/79303923924.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/71a5e3affd4918104036d2a31932f854/zogebexutar.pdfIn PDF document text
- http://ccswcd.com/userfiles/file/28379163227.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/36926292346489770fb157438bdaa740/62755189914.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852e74578f---87009125350.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf3dcb135f0bf695e21561d590d3ff4f/63737115563.pdfIn PDF document text
- https://rsun.pro/admin/ckfinder/userfiles/files/50671494443.pdfIn PDF document text
- http://dlmberatung.ch/userfiles/files/65263791820.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f86c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF86C	18924 bytes
SHA-256: `62b83e3cc9667a3ec04e559e68a508ce55c9267feeefaa0b6059e767bce8a0bb`
`font_01_sfnt_off000128b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128B2	11340 bytes
SHA-256: `2b7442f915be5d8001cd91999b1479413e49acf146c1a1bbaec5be92753549a9`
`font_02_sfnt_off000142d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142D4	16068 bytes
SHA-256: `6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d`
`font_03_sfnt_off000157f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x157F4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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