PDF malware analysis — malicious · 551594418abbf0e6

MALICIOUS

PDF

84.4 KB Created: 2021-06-30 21:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: c17018b2a440f6d2570908a457185986 SHA-1: b1eb8780f6bc91d9877da029ff89431e8d8f8a5b SHA-256: 551594418abbf0e6ce858281d501fcd4463c26e0cf66ad2e20bcf3f6594631cd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of external URI links and a link farm indicates an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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 http://feach.ie/images/uploads/file/zumabowu.pdf In PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pkle2ug2pgmogc7iuhm0e5old6/57593730429.pdfIn PDF document text
- http://aristosaigonhotel.vn/uploads/files/20065291439.pdfIn PDF document text
- http://vtvxm.vn/userfiles/file/34122644071.pdfIn PDF document text
- http://nanumed.ro/uploads/files/65748794836.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/cdqqo2s7rfm446p5o6nfkdl60b/vivofotila.pdfIn PDF document text
- http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48e74ef95---7629765260.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gfj32ipts39jhdfcn3lompeo3j/vewudipevekinod.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5ukrin5di368c8t7gsijcg0lu2/suromujugujawapisobapu.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/lmdg02ok68qlg1vttlm5qo649j/46802843265.pdfIn PDF document text
- https://stancijanegrin.com/UserFiles/files/dabodojojijufogipu.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4151194fb382a70ee9dc0b4dc523eb50/zetexinovinudodeb.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebbd5abd3---sapepagozex.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba521c326d8---suwoborev.pdfIn PDF document text
- https://ankaratemizlikcim.com/depo/sayfaresim/file/32810898054.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfee794749---naxokutirukurekufiro.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094749ed4211---30102717464.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=transmission+of+cryptococcus+neoformansPDF link annotation
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2f79850d40610901dabb309c6ebf0aed/32026626899.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_off0000e91b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE91B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010132.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10132	10772 bytes
SHA-256: `2729188ae8990677bdd8696e7fdea7ea18cd8d8a4664f8931e407a8af0b816cb`
`font_02_sfnt_off00011a0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A0F	16416 bytes
SHA-256: `ac37bec74155df24d8b1be6725d9f8dff9173650360c68f89e8b5464c8c13db0`

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