PDF malware analysis — malicious · 3a9ee0f07d07dc77

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 22:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 405e997bf49d224acec4bd9453dadafc SHA-1: 316d5020be5ad56486f42b8dc2cc951d59a9da7d SHA-256: 3a9ee0f07d07dc779284e9208ca6073b63a6dc4088dae3bd688dc9c40feffc92

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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 https://crysiq.ru/uplcv?utm_term=hct+auto+blood+test+low PDF link annotation
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/54353607dc532197b9beb5f159b290f0/tefawozenipodixemepavifi.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2205cc535a03d0ddfa18107c1e933ca9/lijefifotilupawupive.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d03126cf58c5b74a30a09bf7c7561fe9/wesegojepipasa.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3206450476.pdfIn PDF document text
- http://accronline.com/userfiles/file/28670721849.pdfIn PDF document text
- https://alarrabnews.com/images/content/content/file/pumamokibakebutenuvax.pdfIn PDF document text
- http://lighthouseofworship.com/clients/44803/File/vaduximuzewofejuginasaziz.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2879027e---25978006077.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/dikorarujakudixukuzeb.pdfIn PDF document text
- http://kotolantopeni.cz/file/53153523396.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041b19af90---685701091.pdfIn PDF document text
- https://ortechindustries.ca/ci/userfiles/files/20221181126.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2797f389d7---10066550529.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609071fb8a406---fejajaxavem.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/2tuu32h0kac4agkq4cf7d0kva9/nebiwebegag.pdfIn PDF document text
- https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1d0hki2iejq4j529d2vubqdkrr/tuzoxanadu.pdfIn PDF document text
- https://rotterdampools.com/contents//files/64668635192.pdfIn PDF document text
- https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ol9152lt78iulniqsutrjo0jq2/98568935180.pdfIn PDF document text
- https://likeevent.it/writable/public/userfiles/file/38104111430.pdfIn PDF document text
- http://tribo.kz/userfiles/File/mesuvunevawasike.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6918d1045---52590275691.pdfIn PDF document text
- http://ash-graphy.com/userfiles/file/soputujakogokudine.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609063c47e56f---zofitopipa.pdfIn PDF document text
- http://mistralizmiryonetim.com/uploads/file/41710250268.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a62e15e42e9---19767911526.pdfIn PDF document text
- http://bjaimama.com/data/upload/2021/06/file/202106030117255375.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gc53qunhr9dtmpl87mq1drcuq2/davugonitapowufu.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_off0000e9f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9F6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010208.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10208	17032 bytes
SHA-256: `89c2442a8c992b46584b05c7f39df170b7259c9c87e3cf596c8f9bf8e525edb5`
`font_02_sfnt_off00012e8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E8B	10384 bytes
SHA-256: `80841d6445a3573490c95e63cc2111eafb2600658f3118831ecee8b9acc9a30a`

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