PDF malware analysis — malicious · c0fb11507e1b6429

MALICIOUS

PDF

87.2 KB Created: 2021-07-27 14:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 29f07fce03e5b3e867c66d2abe2af305 SHA-1: e3fae572fe7a354c727fb0c21476ae1c32660c9e SHA-256: c0fb11507e1b6429c740f7cbaee3d32b5d4dc1a0687a06db62fd2f38cb356f05

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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 http://prvugkh.ru/uploads/files/pibimu.pdf In PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/972pvr97qm2ub7e2agdj3ppiq7/fojozixofimob.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/bovelajatuxulikenevim.pdfIn PDF document text
- http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b8035e47---bivufanoziri.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c06a250f---25557681807.pdfIn PDF document text
- http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/2282236880.pdfIn PDF document text
- http://inwallendorf.de/userfiles/file/zuvaworuk.pdfIn PDF document text
- http://agiusfuneraldirectors.com/files/file/5495633479.pdfIn PDF document text
- https://alirezamirmohammadi.com/images/upload/files/nokasowaza.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/eed636d813152a03d7d1fde6f8019959/polobogifopusugujonokamob.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5b02bc8---66326164357.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7f33e287250be64be9693023dde92a6e/42527095089.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90af48bad---ruwom.pdfIn PDF document text
- https://locktactyuma.com/userfiles/file/voxelimejiwenofonore.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ee48cdaf---57286969989.pdfIn PDF document text
- http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11623103624.pdfIn PDF document text
- http://clinivetmadonnadirosa.eu/userfiles/files/49904659356.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tg93jdkiupka2bl559ujjga460/16676468517.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/53ti9h8itpeudq2v01lv29citp/72388152781.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdefebfde8---13905383950.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f1ff3f043---tiramarovovujurawuzoji.pdfIn PDF document text
- http://allmedicus.com/userfiles/file/6257268371.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd70a12c4b---xivowu.pdfIn PDF document text
- https://namdolove.com/FileData/ckfinder/files/20210726_0469F38DB0DD75B7.pdfIn PDF document text
- http://travellightnepal.com/userfiles/file/zevetuburit.pdfIn PDF document text
- https://telewebmarketing.com/FCKeditor/file/mazojavoribezamidolinilo.pdfIn PDF document text
- http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/fivuwal.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ring+size+guide+wishPDF link annotation
- 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_off0000f31a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF31A	10292 bytes
SHA-256: `4252b4efc0843d41bafbe406dea525c53b804b400141f034ebd179c942c3dbbc`
`font_01_sfnt_off00010a06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A06	17212 bytes
SHA-256: `4c483d2995aebe7f7c44614f1162bc76351977bfdb71c9a7cf3a4564cc156d43`
`font_02_sfnt_off00013712.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13712	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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