PDF malware analysis — malicious · 89a9eb4a7baf81ab

MALICIOUS

PDF

89.3 KB Created: 2021-09-20 07:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 59f086c19f19fd6b4fab18c4cdf3dee7 SHA-1: 8d61f9923ff01f1530c609984971d584abf0a26e SHA-256: 89a9eb4a7baf81ab2a63540e2c00135bc9c84c93be8ff3ac5d182e581e6be7c9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to drive traffic to potentially malicious destinations, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://synerhu.ru/uplcv?utm_term=app+bwin+scommesse+android PDF link annotation
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6b666996---4792100182.pdfIn PDF document text
- http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/fewifufimowexugigadumenag.pdfIn PDF document text
- http://talleresjpg.es/img/file/72999191821.pdfIn PDF document text
- http://motopujcovnateplice.cz/userfiles/file/32014066049.pdfIn PDF document text
- https://clubsecurite.fr/webroot/upload/files/jazoxujitilebogorifol.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f6337b49b3ffcc0ec912221c140200eb/99532965666.pdfIn PDF document text
- https://pacpartner.net/images_client/imagesfile/84289473638.pdfIn PDF document text
- https://inprovit.com/ckfinder/userfiles/files/68710382571.pdfIn PDF document text
- http://cowmoo.org/ckfinder/userfiles/files/ganude.pdfIn PDF document text
- http://www.deco-interieure.com/userfiles/file/56861693615.pdfIn PDF document text
- https://by-express.com/upfiles/editor/files/57335291828.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc07a7351---tojofuxamabolodageri.pdfIn PDF document text
- https://asmitahrgroup.com/ckfinder/userfiles/files/96492802174.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0176245b91052d282d0e97f4ce51cd2f/fugimoxevi.pdfIn PDF document text
- http://drivingschool-brno.eu/files/7792760715.pdfIn PDF document text
- http://costruzionibulagna.it/userfiles/files/83387402339.pdfIn PDF document text
- http://prosquash.by/data/40515297672.pdfIn PDF document text
- http://d-innovation.com/upload/files/notuwup.pdfIn PDF document text
- http://zzzwchem.com/upload/files/95251962906.pdfIn PDF document text
- http://budgettranslation.hu/sites/default/files/file/60779188814.pdfIn PDF document text
- https://newcar-rental.com/uploads/files/202109150221171045.pdfIn PDF document text
- https://wtmasonry.com/ckfinder/userfiles/files/kapozuvusovelotumusutoxu.pdfIn PDF document text
- http://centrons.com/uploaded/file/94088338261331b219dc28.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/tokuvubov.pdfIn PDF document text
- http://lrpharmaceutical.com/upload/files/53594772948.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_off0000f543.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF543	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010d55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D55	19352 bytes
SHA-256: `6e93e6af4eb76c6fd598074cddf10723e5a353165cf4cb0fcfdc94bc61702aa4`
`font_02_sfnt_off00013f80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F80	10740 bytes
SHA-256: `3292834afecd78da7d99eac96870114a9119d73c1f2be9b288e2473ecc76c98a`

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