PDF malware analysis — malicious · 9e63091543a04d5a

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1f8d86cc39a16546a7f4097f830dd36f SHA-1: 25eb4c58cbcdba6698f8705071d401109b98146e SHA-256: 9e63091543a04d5a902728bfd7ca228947dd1bb2e9b54b4651a0b0813e465318

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://philabc.ru/uplcv?utm_term=tennis+channel+app+android+tv PDF link annotation
- http://comitatoamiantovelodromo.org/userfiles/file/gipegaremuxebugijomago.pdfIn PDF document text
- http://wccflooring.com/userfiles/files/81865577098.pdfIn PDF document text
- http://ritadas.in/userfiles/file/kipowifigaribilevemasowek.pdfIn PDF document text
- https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ed5eddd11e9d3592371f57a39d71ed9/87988237525.pdfIn PDF document text
- https://parisnordmedical.fr/docs/file/bemulexajumofo.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b669b32ae5---14225013116.pdfIn PDF document text
- http://hiace-yoshikawa.com/js/upload/files/vorifuvavinimixobijum.pdfIn PDF document text
- http://mikailang.com/userfiles/file/20210902082125_790222334.pdfIn PDF document text
- http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/bifakilaraxomibasexaxu.pdfIn PDF document text
- http://msinziniering.com/userfiles/file/rikamisuwuwul.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393347a705c---riwejigigojuwikivotox.pdfIn PDF document text
- http://bischofs-scheune.de/userfiles/file/bazodovawowigapimugo.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ec8796d4b98c1cb266c33491406de05a/93040264657.pdfIn PDF document text
- http://barrybusiness-crm.com/ressource/devis-photo/files/13211606867.pdfIn PDF document text
- https://webmakler.org/userfiles/file/85503695274.pdfIn PDF document text
- http://moristas.com/userfiles/files/26606028182.pdfIn PDF document text
- https://kitapkaplama.com/upload/ckfinder/files/83294425007.pdfIn PDF document text
- https://butyfarm.mm520.net/userfiles/files/jaroviloxeru.pdfIn PDF document text
- https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/5687645367.pdfIn PDF document text
- http://xn--2e0b95unoa536adofm5h.com/userfiles/file/5661440520.pdfIn PDF document text
- http://directopinion.biz/uploads/FCK_files/file/72700590940.pdfIn PDF document text
- https://marsanz.pl/uploads/fck/file/dubefisugukurokuw.pdfIn PDF document text
- http://ozdoby-betonowe21.pl/Upload/file/gofis.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd8561177---zuledobosorivosana.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_off0000c1b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1B5	16552 bytes
SHA-256: `a52445b0c21ae54c796ff190587c6dc145fcef6f3448d7c10cf5b8fbf0cff184`
`font_01_sfnt_off0000ec3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC3E	10640 bytes
SHA-256: `390fa676baa889410a6ce4bfdb30222d124989a20f7015bcd980009add8a1796`
`font_02_sfnt_off0001048b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1048B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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