PDF malware analysis — malicious · dc333ce9aaf6d0dc

MALICIOUS

PDF

73.1 KB Created: 2021-10-05 15:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 29e49a0a7e52e797f8ca7539b6a6c6ff SHA-1: 0c07f359631f44069eaacb84d5949bdf1dd0a6d6 SHA-256: dc333ce9aaf6d0dc3e461ce5ee7b39c4a563c9c03c3a378075080bfeff3186e8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure attempting to trick users into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://radekslodkiewicz.pl/files/file/gupusagetugojurixo.pdf In PDF document text
- http://precisao.org/files/files/sotemoremovawidiwinu.pdfIn PDF document text
- http://sfssolution.com/userfiles/file/30616154786.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493c369e54c---40327512382.pdfIn PDF document text
- https://xn--fiqa735be48e.com/upload/files/gedujubezetawilifimon.pdfIn PDF document text
- http://www.pantonerestauri.com/ckfinder/userfiles/files/90094137026.pdfIn PDF document text
- http://888spirits.com/userfiles/file/6477986112.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613758365147f---gomitamonupabivugukex.pdfIn PDF document text
- https://nhatngudongkinh.com/upload/ckupload/files/46035912165.pdfIn PDF document text
- https://aarushimukhwas.idealviews.com/userfiles/files/pagulesiwotafiwujakonuf.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8c90a0145461a5c9693305f1bd090559/43069138121.pdfIn PDF document text
- http://lt101shop.com/userfiles/files/50459539402.pdfIn PDF document text
- http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/dajosesodezavisuridumam.pdfIn PDF document text
- https://onderdurdu.com/upload/ckfinder/files/95377200392.pdfIn PDF document text
- http://allier-genealogie.org/File:/fanoxiberetujigufenal.pdfIn PDF document text
- https://evpersoneli.net/ev-personeli/file/86882207886.pdfIn PDF document text
- http://csc021.com/userfiles/file/20211002164747_nz7vnt.pdfIn PDF document text
- http://cn-polylysine.com/d/files/zapolixudewedomibigozi.pdfIn PDF document text
- https://10s317.com/uploads/files/202109021822153689.pdfIn PDF document text
- https://maconlux.ovh/userfiles/files/romewufedorusejoti.pdfIn PDF document text
- http://nhatrangpalacehotel.com/app/webroot/upload/files/82494446249.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0c420ddeca5646eee3ed8a8059cb42e5/36130596912.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161462015d3eea---vipogiwidetoza.pdfIn PDF document text
- http://findmecakes.com/userfiles/files/38109282767.pdfIn PDF document text
- https://ihotel2b.com/upfiles/editor/files/zoxin.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=change+icon+to+exePDF 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_off0000b9cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9CB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d1e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1E2	10328 bytes
SHA-256: `bc46e7b7bcfea86c2e7c2a787cc66a2330b3abaff75e575832dfe4f80102d034`
`font_02_sfnt_off0000e92e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE92E	17692 bytes
SHA-256: `7489553db910abe016860f9d53014be9a0b2a7909e26a3509856d58dd32fe027`

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