PDF malware analysis — malicious · 85bda05d6e3afa12

MALICIOUS

PDF

89.0 KB Created: 2021-08-01 21:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 52c22126eb3b9508f077b4b5cceca08c SHA-1: 63fc134b0108990f770c7c639addd3cf6361316a SHA-256: 85bda05d6e3afa1282ef320c0416cc6c9ce99c8e6f90a140a6e9d56a1d94a744

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9986

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://infrive.ru/uplcv?utm_term=how+to+get+free+gold+in+standoff+2+2021 PDF link annotation
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c53421c7b---reruri.pdfIn PDF document text
- https://mut-zur-veraenderung-hambuch.de/userfiles/file/1686568269.pdfIn PDF document text
- https://nusamulticentralestari.com/Uploads/userfiles/files/xibesawu.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44b360e051---xelizorogemifaju.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c3cd8e9d90197e7e9e5815dbad9b2d3f/gemefet.pdfIn PDF document text
- http://albino-pitti.com/pub_img/file/wozike.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75e507892f---35512998763.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a6a2e4f3b4edd34ab8281daf1f2f95bc/kelagezexemag.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8b1802e9---18013937379.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da0a3b583---41575406173.pdfIn PDF document text
- http://pinxedien.net/upload/files/fefanawosebas.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c216f4b5ed2---11043843652.pdfIn PDF document text
- http://bortran.com/upload/image/file/20210517125203.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6df5fdac---36265008186.pdfIn PDF document text
- https://kimcert.org/E/file/bazupipesaxujivo.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/bj44a94fgv6p0pr80vtd3sg67u/jaxaxow.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fbd318fb3---50436235841.pdfIn PDF document text
- http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/7657642107.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e03ccf9b0f884c4b4430f306b6afb4b/gotewixesorogewulu.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfce100e193---makirefenina.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/455q9skb6e6ktbh89dq1ptq2h4/lupenirutagemonin.pdfIn PDF document text
- https://xo-sound.ru/userfiles/file/vozaguvimim.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d4f6ebf6833682f7fa290e6c890198c2/nusimolebejumikodalim.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986e2cd4a09---92292853303.pdfIn PDF document text
- https://telewebmarketing.com/FCKeditor/file/20027825827.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_off0000f7e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7E9	16968 bytes
SHA-256: `7fe2c58ab78349a76e6e50168d72ec7df3dd052f7aaabadb4d64729adbdfc70a`
`font_01_sfnt_off00012429.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12429	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013c40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C40	10900 bytes
SHA-256: `fb7dee3a364f1fada7e4e0425639a00f067978ae0ec953d679457698b6ac463a`

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