PDF malware analysis — malicious · 24b1de20d8e2f7ca

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 22:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f1acb58e52b2b9989d74d49950af3cb4 SHA-1: 2fed7bbc3252d3c946151aac38f5b5b5a74c2bd5 SHA-256: 24b1de20d8e2f7cadc5fcadcffeaef45062695afee27b79d3e310bd04db1d839

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

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://allytemp.ru/uplcv?utm_term=enfermedad+de+crohn+vs+colitis+ulcerosa+pdf PDF link annotation
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa29cc66fdb---37131660517.pdfIn PDF document text
- http://ilkyoukais.com/Images/Media/files/sajixiserifuxewezerud.pdfIn PDF document text
- http://tensoinox.com/userfiles/files/rukevodonugikabi.pdfIn PDF document text
- https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/56a64bf03bdf2cc60ec04a16abb50976/77529340052.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/51c966e501b54185b4963384b2fb3bb2/lunobevoxujawufape.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/41932392011.pdfIn PDF document text
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nejue78ke8fslsmqso0elmlbrv/74935352029.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5ca82115465b2c83e6d55533b6a193ac/11465499029.pdfIn PDF document text
- https://ankaratemizlikcim.com/depo/sayfaresim/file/82598386635.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fbl18spre5s60t88vjjbblf8k9/mijusurufovun.pdfIn PDF document text
- http://isagenixmakessense.com/ckfinder/userfiles/files/39599064120.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/17ce10a3a75884f3b73f1986a7cdc3f1/wawig.pdfIn PDF document text
- https://codecs.ro/images/file/89574482226.pdfIn PDF document text
- https://monyetjoget.com/contents//files/24780957285.pdfIn PDF document text
- http://labotinnghia.com/img/files/61417014213.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/41208438882.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5828a099cbee86a10050418f36915a8e/buduluxepimubojemakasukax.pdfIn PDF document text
- https://medarbindia.org/ckfinder/userfiles/files/95678853244.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/25vd6g7tqtdi0bkn6m11drk3l1/zesasafaxebeziv.pdfIn PDF document text
- http://www.valathors.com/ckfinder/userfiles/files/67504971346.pdfIn PDF document text
- https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/65a761d9af7460b47db6a54e135df82e/sevobarasekada.pdfIn PDF document text
- http://shopcloud.cloud/ckfinder/userfiles/files/jobogobikevajulikilaweri.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94ccf74629---fezugetadeveb.pdfIn PDF document text
- http://sunrui-ti.com/d/files/wenikub.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3f6ab2dea28143a994605936618f64c3/povafovabap.pdfIn PDF document text
- http://venusland.vn/app/webroot/img/files/vunepazevanotoworupux.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_off0000f22b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF22B	11036 bytes
SHA-256: `6fd044c8119b52d4952c81adb6b3825f4eea520c5ff56542329ed48c5ebe893f`
`font_01_sfnt_off00010ba1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BA1	19544 bytes
SHA-256: `a5f0bc20a7eb84a24db7a128b7bcf088960ca3f9fe29658e7408d2a5f1d681cf`
`font_02_sfnt_off00013cc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CC9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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