PDF malware analysis — malicious · 36675dc2c511e7b4

MALICIOUS

PDF

113.0 KB Created: 2021-07-01 18:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 0b34e7830fea1a8d7846a06391eecd06 SHA-1: 5c8eae45c841fbfbfb458ae6309986eefdf62ee8 SHA-256: 36675dc2c511e7b41ca364b959bdb29e3331d9594a7879ee87918c7a7393a8e3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9819

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://madonnina.info/userfiles/files/fawaxusobebeninasilup.pdf In PDF document text
- http://mytmbc.org/fckimage/file/bonivilefelivizexejo.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/cl1i9dovb0dgd1erouq9slpmiv/xozosox.pdfIn PDF document text
- http://vietsinphar.com/uploads/files/zumazesaboduke.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a07d67075---xofimegefuvuzuroxebuvaxi.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee672a9e8---3828524.pdfIn PDF document text
- https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c45bd8d0e---fijafesarig.pdfIn PDF document text
- https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/4sl3nphef0rv55tginepj88fs6/89115937782.pdfIn PDF document text
- https://lacecinella.com/writable/public/userfiles/file/11300593749.pdfIn PDF document text
- https://immo-macedo.lu/userfiles/files/xarudemaragasemijediwu.pdfIn PDF document text
- https://bititechnika.com/uploads/file/sewijakeluragizodu.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5ff72bd49a42c91f00bae5fa9f741be9/57331412406.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p7ljt7fhqbpcsp385ofvht3sih/67659408175.pdfIn PDF document text
- http://www.logomarcanet.com/userfiles/file/3981887161.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aff29df6e---fefidewarugob.pdfIn PDF document text
- http://iziusb.com/userfiles//file/8983249326.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a11871c41b4---sivuzufa.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/61795572960cb2bdb3ae60.pdfIn PDF document text
- http://fonnepal.org/userfiles/file/kunanipokijelatavab.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e0a5814f413d4ab70ca1a2ab1a854af0/88347123817.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca19a33460---78884467694.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afbebe4a2cc---samologimi.pdfIn PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087d01c074f6---puwolebob.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/247b1992e8e1ccf2310f053f4e49a0fc/4026660813.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c12453db3bd---rutuxenatodozen.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/di83ctf8obeh35d1igaeaqlb7v/kivuxisuzepow.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=simple+science+experimentsPDF 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_off000155b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x155B5	10432 bytes
SHA-256: `e0216ba46c66cd320bbfa1170b8fb09a01bc7843107f85d3487730653e28f705`
`font_01_sfnt_off00016d43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16D43	18064 bytes
SHA-256: `6d432c074efe3862bc3f49c32f4f72039f4d009e6d6ce85a35c65e30db80bcc8`
`font_02_sfnt_off00019d11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19D11	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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