PDF malware analysis — malicious · 73f7122ce074934a

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 17:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 89c80337380cff65a929e4f7f0da5122 SHA-1: 1f947085aa7046b3849134567c9afa988e259d2a SHA-256: 73f7122ce074934ae137b93389fc91b86df470983c1e87c9ce127c9a0704e1b1

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=ley+de+impuesto+sobre+la+renta+pdf+2019 PDF link annotation
- http://cathyknightwaite.com/ckfinder/userfiles/files/julesuti.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/671a06977d75cbcbf36a68daaffe3011/49156980005.pdfIn PDF document text
- http://sapientgenerator.ru/files/userfiles/files/93866908928.pdfIn PDF document text
- https://secolink.sk/userfiles/file/7656117544.pdfIn PDF document text
- http://bibliotekaludwin.pl/img/upload/files/nowopo.pdfIn PDF document text
- https://wagaskar.com/media/70722848634.pdfIn PDF document text
- https://mzlpro.com/web/img/podborky/files/datifugujovadipozuzu.pdfIn PDF document text
- http://sgd42.ru/userfiles/file/86145109273.pdfIn PDF document text
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cb255c8c0---jidomu.pdfIn PDF document text
- https://zenit-npk.ru/files/file/76291405979.pdfIn PDF document text
- https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/98572313100.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0422c719ab---gufofanudur.pdfIn PDF document text
- http://cementfeet.com/userfiles/file/ruluxuvixikajepasukadil.pdfIn PDF document text
- https://homestayhoian.thamtuddt.com/uploads/image/files/ritovazuwuvuseju.pdfIn PDF document text
- https://postele-z-masivu.sk/ckfinder/userfiles/files/32457226932.pdfIn PDF document text
- https://stratasphere.online/userfiles/file/gadije.pdfIn PDF document text
- http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/25926854199.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60548c089---61531569371.pdfIn PDF document text
- http://regalmotors-jp.com/js/upload/files/62112118375.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16115ed36bc40b---69504335612.pdfIn PDF document text
- http://ajtoablakcentrum.com/_user/file/nenowovaxubopamibav.pdfIn PDF document text
- https://podiummagazinenews.com/ckfinder/userfiles/files/86872204841.pdfIn PDF document text
- http://beloezoloto.ru/userfiles/file/junevawatobuxanos.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_off0000bad8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAD8	17864 bytes
SHA-256: `824a1a6f03e88af9f0c3257cad6235e53e5166a43d1ae8e82828a9582b7dd0ce`
`font_01_sfnt_off0000e821.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE821	11432 bytes
SHA-256: `d950b514bb6498fbb12ab9697a2c86cb4b39d784d9347bd3985c37a52132133d`
`font_02_sfnt_off000102f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102F2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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