PDF malware analysis — malicious · e3b5ef17c95954d3

MALICIOUS

PDF

72.8 KB Created: 2021-09-23 03:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 86d762111d8c27b6d4828e6d5d03e47b SHA-1: b5d092e76550652ddf427953176930ba11b675da SHA-256: e3b5ef17c95954d34b743faaa1dfe7643b0ff1f793360ddf5c0d2521f482cf53

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. ClamAV and ML classifiers strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this, as these are often used to host malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

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.
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://catamma.ru/uplcv?utm_term=max+hd+video+player+pro+apk PDF link annotation
- https://myphambambi.com/webroot/img/files/renaxedebomokonom.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vunsq1gec7eegoqpfiddph7o5m/13530111267.pdfIn PDF document text
- http://valkexclusief.reviews/app/webroot/files/userfiles/files/vedidizurowatedogesid.pdfIn PDF document text
- http://crisismobile.com/ckfinder/userfiles/files/44517282436.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140cafcb959e---40063431143.pdfIn PDF document text
- http://www.tiande-global.com/ckfinder/userfiles/files/5248008735.pdfIn PDF document text
- http://scales-center.com/shop/fck_file/file/rumupuredesinifisub.pdfIn PDF document text
- https://gulamanis.com/contents/files/samitezelaxasomomuzi.pdfIn PDF document text
- http://alsace.annuaire-regional.com/ckfinder/userfiles/files/zoxedajakimixatixipobi.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cfd8751d2---wetidakugupulura.pdfIn PDF document text
- http://euroteam.vn/ckfinder/userfiles/files/sumav.pdfIn PDF document text
- https://corpeverest.com/ckfinder/userfiles/files/3357740863.pdfIn PDF document text
- http://neoneophytou.com/ckfinder/userfiles/files/zedivi.pdfIn PDF document text
- https://megalightgroup.lv/uploads/files/karux.pdfIn PDF document text
- http://www.catedralirodahaz.hu/data/editorfile/81622158939.pdfIn PDF document text
- http://ovstav.cz/app/webroot/files/files/5568000831.pdfIn PDF document text
- http://boonfagrandhome.com/user_img/files/bugewabuliz.pdfIn PDF document text
- http://ahzycw.com/upload_fck/file/2021-9-12/20210912103711350519.pdfIn PDF document text
- http://evolution-dev.com/file_media/file_image/file/56817033064.pdfIn PDF document text
- https://bawaniint.com/ckfinder/userfiles/files/mamomag.pdfIn PDF document text
- https://eltechma.com/zdjecia/fck/file/21621402944.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161490f24e8ed6---97293135854.pdfIn PDF document text
- http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fipukaza.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/452587ee0c3b7aa2541259102639afd2/noboxi.pdfIn PDF document text
- http://pharmabiosolutions.com/filespath/files/20210909165503.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_off0000baba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBABA	16400 bytes
SHA-256: `11ccb8717ec287247daa6561ea4b96b279761a44e5c9b20d17ffd22ae5426b62`
`font_01_sfnt_off0000e57c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE57C	10488 bytes
SHA-256: `9771e481a18dd4b13e3dd981fc23fbb192b95a01317ddbf276ab12dbe9b5d034`
`font_02_sfnt_off0000fd6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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