PDF malware analysis — malicious · 4d461cd4d72ec6b9

MALICIOUS

PDF

84.1 KB Created: 2021-08-05 09:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: cac03a7d24decb2e8b614b3ae4a7fd3c SHA-1: 1ef5a43a2c24c32af731776c93d6c1db120ff59d SHA-256: 4d461cd4d72ec6b910e17f4cc7dfcec89c08c24f36ba45db65b49a82aee7f28f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination through multiple redirects and compromised infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9925

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=human+anatomy+frederic+martini+8th+edition+pdf PDF link annotation
- http://donateagift.eu/userfiles/file/63319243688.pdfIn PDF document text
- https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/56acad4e42e69de711aaf63534d50c38/54469522972.pdfIn PDF document text
- https://aradmissions.com/ci/userfiles/files/xafir.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a22e1c98f---texavo.pdfIn PDF document text
- http://banlinhkienlaptop.com/userfiles/file/xezakufurozabusojobaliw.pdfIn PDF document text
- http://hzzxtl.com/UploadFile/file/20210702200019831.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa232f10f---ruwenarisomobame.pdfIn PDF document text
- https://invest.pl/userfiles/file/sukogufigutok.pdfIn PDF document text
- http://www.moyekolodin.com/files/zatagujetupudiliputugozig.pdfIn PDF document text
- http://alumcity.ru/userfiles/file/ragizodejasasileg.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160738703d342a---7374376159.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926d3475fc---72583487797.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bff8d1bf6---fiviw.pdfIn PDF document text
- https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3ee396cce084b9dbcc27e5b1e09b6b80/zusalomelitikodaxexagi.pdfIn PDF document text
- http://sirmamedia.com/ckfinder/userfiles/files/dedija.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085803308c2f---93232014002.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2dc5c6b06---1373924938.pdfIn PDF document text
- https://www.truck-transport.com/ckfinder/userfiles/files/dupovoz.pdfIn PDF document text
- https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/13e494c92087d488dca7aa32de38ec12/20115486663.pdfIn PDF document text
- https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f22b6e2d1---vewul.pdfIn PDF document text
- http://gerd-pollak.de/userfiles/file/bolowub.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec4f6d403e---rorofoguwag.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/27e07d9beb5f80b365ca4ef41758cebf/1968909561.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c53a4ea---30700573752.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee72f0db2a0---85703421145.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_off0000e338.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE338	16968 bytes
SHA-256: `5607cb9feacf923229b6c8dd5af79ae8a096882e343bc766a5a239499456fc10`
`font_01_sfnt_off00010fea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FEA	11084 bytes
SHA-256: `3b9dfcf943793d269262304b18a8c8dc87ac47ea3d1aab32dd3ef4888dc8e51c`
`font_02_sfnt_off0001298f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1298F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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