PDF malware analysis — malicious · 457caf481f646144

MALICIOUS

PDF

85.5 KB Created: 2021-08-08 04:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 1505a3ed76916b97b33aca788ab57bb3 SHA-1: 1897330008937d06a142494e8d25c5f78b27eee6 SHA-256: 457caf481f646144de6f7d1b0b3f9efc7a0d9db7f3926a8d2b34f12ef1fa744b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://nomylo.ru/uplcv?utm_term=hauteur+panier+basket PDF link annotation
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931478629c6---zilurapuraxufomitevan.pdfIn PDF document text
- https://aakritidigitals.com/userfiles/files/rupan.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9cedcmmher2c87o6k5p4gcdtd6/78717451822.pdfIn PDF document text
- https://mariellatriolo.it/public/file/zarebawubovizuzafefugeri.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160927d7dc249d---20960436622.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794e8876c2a---vuneduxonizukenuv.pdfIn PDF document text
- https://alusol-kw.com/ckfinder/userfiles/files/zekajunejenujarebifagejog.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56a71aaa3---daguwaxiwaratogefoxi.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ee57bf56be08401b8104b44225d21846/pegadojineri.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40c17e4a5---nafotisudifirotifobiwo.pdfIn PDF document text
- http://joyearland.com/ckfinder/userfiles/files/28739465393.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/wavasisu.pdfIn PDF document text
- http://motelandratecuci.ro/userfiles/file/80360219771.pdfIn PDF document text
- http://myphamlulanjina.com/upload/files/35623941189.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/refofafiro.pdfIn PDF document text
- http://volamtuyetthe.com/userfiles/file/59494114505.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3faec821---xabikixakeregigewokiw.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/huqolh16btmi0cvd0l8tq155ej/99613703210.pdfIn PDF document text
- http://ithaca1962.com/clients/41687/File/11715286794.pdfIn PDF document text
- http://inter-travel.hu/_user/file/nafakubem.pdfIn PDF document text
- http://cosmickino.ru/sadm_files/pejubulorudi.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d674d0d3fa---82729259938.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cefc93ecf---lemepibexinaki.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c259b8cbfcc661b2438ddcdbf125cfb4/tuxatejavodex.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822151a45c6---16706555627.pdfIn PDF document text
- http://guchenes.com/d/files/pugupifalufow.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_off0000e8e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8E9	10404 bytes
SHA-256: `069b08111d9887194e221d9a1795b763978f811c2373988982942e09a45b5bd3`
`font_01_sfnt_off0001004f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1004F	18340 bytes
SHA-256: `d764e535d0b4104b994b2bb6ec848e6f9442f7b9d1eb0af9f7209d472f319802`
`font_02_sfnt_off00012de9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DE9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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