PDF malware analysis — malicious · b0539edd385302aa

MALICIOUS

PDF

100.0 KB Created: 2021-07-16 18:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: f5301985288c0623aea8a7d05f0cd589 SHA-1: c5fcbb9867fc8cc499b03eba54ecc35bdb262970 SHA-256: b0539edd385302aa90280b082f3f58feb0d128dd8855deca0476d8e96cebeb53

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and embedded URLs pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9800

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 http://sztarmedia.hu/_user/file/51142384375.pdf In PDF document text
- https://emmaushuis.org/pages/parodegolasufob.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ceb864d7ce983b3f66c400bed7ede045/guwawapeliruxesawomo.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3a2593f589158e2dda0aa27064eb5ada/lugodokawuvibo.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qjrek8185uodm0ojnptm8bcl25/13865700932.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/93f55647243949976fbb4694af964562/92911260219.pdfIn PDF document text
- https://bhsbeacon.com/FCKeditor/file/rawik.pdfIn PDF document text
- http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ec40b0208d57a455b586ab34ad40d591/fetejamubulavuborudasexu.pdfIn PDF document text
- http://nutronicltd.com/userfiles/file/ketovikebimojatu.pdfIn PDF document text
- http://misspacificus.com/clients/873634/File/16718797808.pdfIn PDF document text
- http://szyuangang.com/UserFiles/file///28580839781.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb948b2b59---vopimekizomikixa.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d480aae722a38331253fa8640a375dbd/39871789013.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62837e7aa---59881342311.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e0983565144a611a961e8e40c55fb243/nisinitovejeviporumola.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/anjhd775he5nr89cv50vfk98j5/lorojakutebujaxukuvotif.pdfIn PDF document text
- http://ksnjl.com/userfiles/files/fupelipe.pdfIn PDF document text
- https://cakenepal.com/userfiles/file/rogagamuzezefomovamuv.pdfIn PDF document text
- http://zdrowejaja.com/Upload/file/kisiz.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a6146bb9cd9efdee6b5d24042704a6ff/ponijurolajugaf.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607051920249a---nekober.pdfIn PDF document text
- https://bushregenerators.net/userfiles/files/64673935252.pdfIn PDF document text
- http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/jigibaxojuf.pdfIn PDF document text
- http://bendhorseride.com/userfiles/file/29878513919.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b7e54480ef165fd3613ba95c4cf527db/3622357339.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0a810a536c4ef4a253b9e2bee5b26e6c/13190985749.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=math+for+college+readiness+answersPDF link annotation
- 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_off000122ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122EA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013afc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AFC	18220 bytes
SHA-256: `73a3024b7016ef5e23ec20e7d18a8feafc3f444454f26c9f0aabc089137e2b8a`
`font_02_sfnt_off000169c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x169C4	10836 bytes
SHA-256: `88b1e30d84cd8f8455a2cc6f620d10b3dd8ba1cdec861cec9193038f98fec27e`

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