PDF malware analysis — malicious · 31c0c4f1178ea246

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 07:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ffe1dded11efd452c22b4eb9e440b53d SHA-1: 7f8c4da6f8dbb050955d1ae962126bd9329f86e1 SHA-256: 31c0c4f1178ea246cca125c63d165498934442702e841d0b4278f621fc789872

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised upload storage or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to host or redirect to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 7

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.
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://upbilbao.com/ckfinder/userfiles/files/1810328354.pdf In PDF document text
- http://cattaneoarchitetti.it/userfiles/files/14077488446.pdfIn PDF document text
- http://domexpo.ru/up/file/vaxotef.pdfIn PDF document text
- https://siliconautomation.com/userfiles/file/zelapisi.pdfIn PDF document text
- http://parquet-cortes.fr/data/Files/fosexatawidetavovifumesas.pdfIn PDF document text
- http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/74466257610.pdfIn PDF document text
- https://bokaichenyu.com/upload/files/xalisapi.pdfIn PDF document text
- https://bccphil.paramedix.biz/uploadfiles/file/7813124656.pdfIn PDF document text
- http://timebymtm.com/upload/files/zaxakeximudanepudoputila.pdfIn PDF document text
- http://wpchkg.com/upload/image/file/58159519973.pdfIn PDF document text
- https://khotelmarket.com/FileData/ckfinder/files/20210912_747C637D684A9439.pdfIn PDF document text
- https://ural-aiti.ru/admin/ckfinder/userfiles/files/baworaloji.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/06875e9d5e7b42f91ce6ad568eb2bfc3/450410860.pdfIn PDF document text
- http://www.globalnautique.nl/upload/files/mizobuta.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613289b3922a2---radorufu.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21eca1332---5422296742.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea0a54904858fc73d214a3afced0b449/bajuxisenelikaxegaf.pdfIn PDF document text
- http://sgpeo.pl/users/file/65639439859.pdfIn PDF document text
- https://stormester.no/files/file/91166891248.pdfIn PDF document text
- https://ln80.cn/filespath/files/20210913110109.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ea822e32---91422696532.pdfIn PDF document text
- http://eros-arena-reutlingen.de/eros/userfiles/file/79384575640.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613489d9a9439---tosit.pdfIn PDF document text
- https://kientrucqhouse.com/uploads/image/files/47240943696.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+best+emulator+for+low+end+pcPDF 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_off0000d522.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD522	11084 bytes
SHA-256: `5daa351f6eb7608f15a84152bae4d4a512d50bd0c1a63d16c2068b10461c1815`
`font_01_sfnt_off0000eea1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA1	16800 bytes
SHA-256: `8a18b1c44e60efa65bb66cb9501b37d339bdc06f9d5c8cbc4670146854c1eba0`
`font_02_sfnt_off00011a50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A50	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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