PDF malware analysis — malicious · 6c38a858c45dfcdf

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 07:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 82ff0960575af3b66d90bd716c36bf8d SHA-1: f7ca532c301bae753b9513311314b680514aa5e4 SHA-256: 6c38a858c45dfcdf601ff0bdfefb0f8143f8b27e515e76a2a130b84911a5a483

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of numerous unknown URLs indicates a likely phishing or redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085cb285d23---93324225608.pdf In PDF document text
- http://pphu-joanna.pl/fckpliki/file/10382987283.pdfIn PDF document text
- http://banquat.com/userfiles/files/20121154244.pdfIn PDF document text
- http://ccspevents.com/clients/24998/File/27845205855.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/54418570200.pdfIn PDF document text
- https://airshow-bg.com/file/mupegemegajibobivivel.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd4e4cb98---32242565966.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/40deee929e5e0eb30fcbaac1f32ecb15/digivusarezewupuvonara.pdfIn PDF document text
- https://adasms.fr/userfiles/file/70112783553.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081263c490de---67880990092.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae106ef565---76429689631.pdfIn PDF document text
- https://stka.gr/ckfinder/userfiles/files/xulosepe.pdfIn PDF document text
- https://gruppopolidori.com/upload/image/file/50920120553.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/e3qdp4vmvd3uui6ah974udrs26/razusotibulinepikunaleto.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3cd8dbfaff999b72783b54ad4639152c/8718736190.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a26872b6850---bujixijakudupugov.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d00a6c80a---46382900730.pdfIn PDF document text
- http://nakamurasangyou.jp/app/webroot/uploads/files/lebilovugakedex.pdfIn PDF document text
- http://reklamavysocina.cz/UserFiles/File/82100459481.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f49ead27---budasisuwewe.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f4895bc9---67429511785.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bac1c4e3---87713947660.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ee529298d92c72018ea2e0376b5cfd8c/80480860881.pdfIn PDF document text
- https://vipbeachhouse.com/uploads/editor/file/96772585477.pdfIn PDF document text
- http://efuturesthai.com/uploads/file/salakifijurolu.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf89bd3b4---zefanabopunozupememas.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=saab+9000+aero+manual+for+salePDF 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_off0000e195.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE195	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f9a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9A7	18176 bytes
SHA-256: `b4c8758b45db14123fc300ba908566ab8a99aa3e77b7c8b2da1bd01a9261ad96`
`font_02_sfnt_off000128f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128F8	10792 bytes
SHA-256: `c39aa8af1533872489b287ffca9d512c632c129229103fbb59544d5e0256b2f7`

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