PDF malware analysis — malicious · 1a9b20fce2e34570

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 13:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 45071c3144a556f0edad381b5f5b4869 SHA-1: 15fa192b6fa6244292f3abe974aa6cde6770212f SHA-256: 1a9b20fce2e34570debea158a000ecccbb237008b30ee1f1d4ca7d9db03288b2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The presence of 'utm_term=passport+application+child+pdf' in one URL strongly indicates a lure for sensitive information or further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://coretry.ru/uplcv?utm_term=passport+application+child+pdf PDF link annotation
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd5c442635---55844483121.pdfIn PDF document text
- http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/62901967850.pdfIn PDF document text
- http://oryginalnedekoracje.pl/userfiles/file/52265924437.pdfIn PDF document text
- http://greenbiotech.vn/uploads/userfiles/file/68779005366.pdfIn PDF document text
- https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/d90b4feffe7d2c6e73562e2a2afa6f8d/fivenesavosefimezifarop.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ddedf8b23ae2800790356b13c98b57cd/37885828611.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb3eccbff---99129135908.pdfIn PDF document text
- http://kmkonsult.cz/userfiles/file/gubap.pdfIn PDF document text
- http://charivne.info/images/file/11622906301.pdfIn PDF document text
- https://birotex.rs/images/files/lidilapunerok.pdfIn PDF document text
- https://www.hippocratio.gr/ckfinder/userfiles/files/34826521974.pdfIn PDF document text
- http://giasuminhtam.com/Images_upload/files/88219677714.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4d1db1659135e764d7ea97b74e47a178/4259030238.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/365e73f7d981d73d27d34d4ff9e483f9/mitejipogugurarizal.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5c92130b---gedew.pdfIn PDF document text
- http://brianhaymore.com/images/e/file/53670824609.pdfIn PDF document text
- https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9194bec47d26c509026e53d9038ad2e2/legetujuraxodobalagep.pdfIn PDF document text
- https://angkalaris.com/contents/files/34434259844.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161327c70ed160---nefutijaf.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6ap418nmj420cq8coksh7ea5in/tesimir.pdfIn PDF document text
- http://kaiyudachem.com/filespath/files/20210802003638.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t4g4qjdj2pt457ecnhr00gc71i/womajixu.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ad1f11c2775d9db66c050bd471785332/9953642840.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/11a5f05641847073788e195d03fbcfdf/bobelufegelavuvuvupudi.pdfIn PDF document text
- http://accapierre.it/userfiles/files/temukugogukavumifepa.pdfIn PDF document text
- https://arch.ua/ckfinder/userfiles/files/vixamewazeno.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_off0000e788.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE788	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF9F	10588 bytes
SHA-256: `0d5002e810ee7db390f25c5f9908f149a085857f51a907bb63d203e219250ba9`
`font_02_sfnt_off000117ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117AD	18464 bytes
SHA-256: `33383ebdd7774622dc008eb4e06ef5413362db631eb2ce34f2428710cb3d731f`

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