PDF malware analysis — malicious · 76dfb2ed514e1b5f

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 12:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ff2d8c0158e31270e0af73ef91252ebb SHA-1: 3ead01fe292d6956b1b6db545d19793dbf32955c SHA-256: 76dfb2ed514e1b5f4acd3ae700572b13bde7100e5dbce1a496602ca648786ac8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=mod+apk+snake+rivals PDF link annotation
- https://s-oil.hoakhanh.vn/uploads/image/files/93705098388.pdfIn PDF document text
- https://davidfoleyinc.com/userfiles/file/85210053202.pdfIn PDF document text
- http://apart1day.ru/file/79616558238.pdfIn PDF document text
- https://futurefacesmiami.com/uploads/file/masijufileruk.pdfIn PDF document text
- http://bioident.pl/photos_fck/file/darisakixowejurutemumi.pdfIn PDF document text
- https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkmv3oo4prb0t56u3mdbm3q219/wiloma.pdfIn PDF document text
- https://pima-alarms.eu/slicice/file/sufomobitixidifetipu.pdfIn PDF document text
- http://uceng.net/_UploadFile/Images/file/15579076859.pdfIn PDF document text
- http://worldnaturalfood.com/image/upload/File/96598779439.pdfIn PDF document text
- http://vinhhangvien.com/upload/files/daxenazizojud.pdfIn PDF document text
- http://fusiongrup.ro/userfiles/file/29473362888.pdfIn PDF document text
- http://shamayachts.com/upload/file/32462587589.pdfIn PDF document text
- https://charterfori.ir/basefile/charterforiir/files/6081493080.pdfIn PDF document text
- https://podgoricki-klub.me/userfiles/file/tilojagifurikujuvaduzuvi.pdfIn PDF document text
- https://pcparts.fr/ckfinder/userfiles/files/2911372469.pdfIn PDF document text
- https://biomisszio.hu/tmp/dofiwofumujesiwusufuzu.pdfIn PDF document text
- http://leinerpakgelatine.com/survey/userfiles/files/29294838407.pdfIn PDF document text
- http://orderkai.com/uploads/files/56359124364.pdfIn PDF document text
- https://nakatarikaszel.pl/app/webroot/userfiles/file/35795445864.pdfIn PDF document text
- http://wabasnb.com/files/fckeditor/file/1645473255612ff6e502cba.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0c8d6daf7ad34ca2790e605cdab5ad60/zobepofiwisaredurejore.pdfIn PDF document text
- https://agriturismoilcolle.org/userfiles/file/moxidi.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/48f2037d70e84410b4061105bc14e1b1/54018701395.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6ccba038f8cc86aa9ff3072a49d8ecbc/lanovaruzapu.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/xuzigidovixa.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_off0000e4d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4D1	10436 bytes
SHA-256: `e7fd9a2712aa5b4ab68fc737d0ce2b4ecce403ab08c8f87b6ec95f6e2645c35f`
`font_01_sfnt_off0000fc92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC92	18196 bytes
SHA-256: `a62a3910cc82444f8f03c980b8b131c2151295dce9dc8d0803343ab4a37ec080`
`font_02_sfnt_off00012bfe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BFE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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