PDF malware analysis — malicious · a8a1e78dc74e7b8d

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 17:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: aae62dc91f5ee4827ce3995d2f25bbf6 SHA-1: a9c2b0178e25edbd9b6f386a9ca19c3b07c36617 SHA-256: a8a1e78dc74e7b8d98debe5708ae621494fff603838d088fcf935286402b04fa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=oseanografi+perikanan+pdf PDF link annotation
- https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/87caeoj4mthlngruula93skt87/gavezujeradenas.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f08c45a9aa9---51943547472.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd871bd93f6---2680546612.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/65ac23fd4c715c9a83531eba9350f7f6/jolixibamapaxuxogeneguz.pdfIn PDF document text
- http://abwingsbuffalo.com/uploads/files/4530057634.pdfIn PDF document text
- http://mcutech.net/upload/2021/08/file/16281220952038148321.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/kivozitadavikoruxeg.pdfIn PDF document text
- http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/demezafeji.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa6ebb892---23170100133.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ab8eceef---85534059604.pdfIn PDF document text
- https://mysmartedu.com/uploadimages/files/dimerojafewunom.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f76fee839d5---nabarugegep.pdfIn PDF document text
- https://www.stnedu.com/ckfinder/upload/files/dolutezanoxo.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/53831516145.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47d701c5a8---94443354125.pdfIn PDF document text
- http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/nejoten.pdfIn PDF document text
- https://wotfiles.com/ckfinder/userfiles/files/jalede.pdfIn PDF document text
- https://bjjewels.net/nbloom/fckuploads/file/91465635859.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ce52c039---bigebojokufusebimefojalel.pdfIn PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/dcf2743978bf2432a2919d74db73ea1e/67024939633.pdfIn PDF document text
- http://raylutickenterprises.com/userfiles/files/sutefidogagewexixo.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128d44e5ac3b---fikemo.pdfIn PDF document text
- http://melly-incendie.fr/img_db/98719135331.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6591f2b5---fezejimidikopasizolosaxo.pdfIn PDF document text
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/gv6k9uub46g6ekmthgunmp6lcs/jotezemolemuma.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_off0000da45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA45	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f257.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF257	16804 bytes
SHA-256: `9e1641fbee364313518dd9222b9cb474b9d2b0865347da9aec0f37f6436817f1`
`font_02_sfnt_off00011da0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DA0	10644 bytes
SHA-256: `5bff0cd01f35cc4166ccc1ed45e6e3982f7f8bb08f6390192a93d699ac8f2bf8`

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