PDF malware analysis — malicious · 507dfe1614608d48

MALICIOUS

PDF

76.2 KB Created: 2021-07-20 22:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 455947dbb0af1e778112794742222ab2 SHA-1: a4371411e1b6dc12f24f51bddceff811a144d904 SHA-256: 507dfe1614608d48125f3defb9736e7b467758e3e3a2cd198a7be86ebe0da2d0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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 http://radio6deenero.com/uploaded/files/4896521352.pdf In PDF document text
- http://kuhomania.ru/ckfinder/userfiles/files/xufabogovajutidigedegul.pdfIn PDF document text
- http://hyundaidongdo3s.com/images/files/witaxamumenubozebirojolud.pdfIn PDF document text
- http://adamslakeband.org/userfiles/file/13134510272.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bab4fac2474---8673977306.pdfIn PDF document text
- https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/2eac91279de5f4d6dc9a00baf44adfd2/nofexuvadesiregoz.pdfIn PDF document text
- https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b6c63808e0a8a1486aeec4724f44ed1b/40013942530.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f8a8d8278---76320394871.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc3b16211---wufizorovusadapamas.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6cab993fac65656fbed9acc1c0fcbc23/73177074336.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d9ea6b27---tufabotare.pdfIn PDF document text
- http://bpsstudio.hu/uploads/93519104148.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/944df63faf212c810faf133a4c8e0da0/2830456144.pdfIn PDF document text
- https://purmoradiatoriai.lt/images/files/80332719377.pdfIn PDF document text
- http://hsound.ro/images/custom/file/91003813776.pdfIn PDF document text
- https://medicabg.com/uploads/wysiwyg/files/32018076336.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607875686454a---texukufonijuwunizirikup.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c199c7d7191---5150373881.pdfIn PDF document text
- http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/16254753583.pdfIn PDF document text
- https://mimpishio2.net/contents//files/duvopa.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac894fd2e48---57406258181.pdfIn PDF document text
- http://animationcoach.com/userfiles/file/xedodepibiguvanupufeduji.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ac93428efc6b21cb2c71558a3eb57fad/seked.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7mbthavkao0gf6tipbu3a5gp85/58461991293.pdfIn PDF document text
- http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dd63c6a9fd2---kotajafemipawadaxukosala.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abd42a577---fuvopoveb.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=newmarket+pitch+and+puttPDF 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_off0000c5df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5DF	17312 bytes
SHA-256: `a2a761685a4cd69e37875c62667cf334f53f290e29206d02bf75c436727e4000`
`font_01_sfnt_off0000f339.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF339	10700 bytes
SHA-256: `8400572a8811ab275e554435e5718fc1238b5d25b6934d6c5ed605959ef6b537`
`font_02_sfnt_off00010b9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B9C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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