PDF malware analysis — malicious · 4fe4540a65dd2e5e

MALICIOUS

PDF

79.5 KB Created: 2021-07-06 18:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 9510cfa2f2f2df96eafd5afa3992b07e SHA-1: de02e54c9f7fa0d4d5c1ce2db9e0812056de3249 SHA-256: 4fe4540a65dd2e5ef4725dabbef9d22c4a02800ebaefc2ccffcc5104b019e465

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, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=ms+frizzle+naked PDF link annotation
- http://jinanxintiandi.com/userfiles/files/56298932858.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6aaab990---52199588454.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/md3asjoobcdc3t10viaqdbdifn/waxomum.pdfIn PDF document text
- http://jrmhandling.nl/upload/file/31490862604.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/binajexelik.pdfIn PDF document text
- http://st-ark.it/userfiles/files/78883247224.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6cb4dd5df38dbbeb60c0f439627d1588/85486149179.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834025ecb4c---6153205173.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607149543ffe9---98102099153.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8mvr09ctlrv2oqm89ch065lmg3/ludiraretisamurobukaze.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3qqma44rqh6pssa9mvj6kfu376/dajevexa.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0ed81617---geperubuzapagagefopi.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/563dc6e5178a6a4f45699d31ea970c4f/letofunufar.pdfIn PDF document text
- http://cyuanmei.com/userfiles/file/3060163211.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9468a9266---vojubebokewunopa.pdfIn PDF document text
- https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/djv11759ht80lgbdt1iht05ot3/kejulutejuzanega.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607679b65777f---1486107860.pdfIn PDF document text
- http://poorclarescork.ie/images/68622704086.pdfIn PDF document text
- https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/l9sr4o7au4h0gl1ho72oid5euh/83394055404.pdfIn PDF document text
- https://vntdc.com/upload/fck/file/zajerotibupofod.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c962c8f343---59485148799.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b392182f---4031759661.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/69fbmispqb6mho3nr1bmoihvf3/82084569174.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vce2btp0cfjel0g3h9p22tn92o/zifaxagaguwapebelewezub.pdfIn PDF document text
- http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9dc8630b5c0ff0a835c5a6550e3dcf4a/sarajari.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/117294d98d10292a03190616959568b2/11025241476.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_off0000d879.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD879	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f08b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF08B	16048 bytes
SHA-256: `a398698ad715c7d6be698c9d5f30adae19b3ad5809e7eb2de1f6ff660b25b36b`
`font_02_sfnt_off000119c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119C3	10276 bytes
SHA-256: `57c4f7797d6edbedc4c805a3a5bbdd883a10a2818a4153d53a47b77e8fcc8882`

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