PDF malware analysis — malicious · e7f4b4896d8330fa

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 19:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02

MD5: 48dfa6dbc26a68424dd0898ee395671a SHA-1: fc84487cd8f7e35a9ec72019a1964cdce3e6b16c SHA-256: e7f4b4896d8330fa46104b5f21de785b5cfd354eb9b65b5e47c07c19a8e7d02b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbe1a7bbf---52770218076.pdf In PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608739cd85539---88001813150.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607966a31e663---vofosebafukokesitino.pdfIn PDF document text
- http://pinturasoltra.com/images/slider/files/suxuxegagupoxedatakuk.pdfIn PDF document text
- https://gencshow.com/upload/ckfinder/files/gowoxugedabisi.pdfIn PDF document text
- https://etcbt.com/userfiles/file/jomidorafefosipemexebij.pdfIn PDF document text
- http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/sogivuramekuka.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4dhkmm4k63811csbtb1f3gutm2/tofaruwemajigamomi.pdfIn PDF document text
- http://avalon-essenzen.at/userfiles/file/nudizikusedajugixafepu.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f58366503e1---fafedokunubo.pdfIn PDF document text
- http://russia-ex.com/images/blog//file/99442250222.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf464676c---fupemulijed.pdfIn PDF document text
- http://www.anjhimayath.com/upload/file/lakaredoworobowez.pdfIn PDF document text
- http://quangcaosms.org/media/ftp/file/7210710819.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2878c64fcf2df4dca68dbd05c355b8e8/97509311092.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/95c014684faf3c5c8efc9db1eb977917/suzominorirasowejeko.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd38be3da5ebea2a9a377c033f2b7760/74831031178.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8a2adda8f4832959b63412c670e82d39/jixupolumajamozakexaw.pdfIn PDF document text
- https://szalkasszorutacskok.hu/app/webroot/files/content/files/nidepi.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a7fd3dc9---3533522632.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073eda6c117b---23665630849.pdfIn PDF document text
- http://startent.ru/SITE/files/editor/file/tonitetifarasigovavezoji.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b164ed6db1e---xuwilufivoneta.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cad7303dc88---17137784592.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098745b12132---pulutazezuwo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=le+courant+%C3%A9lectrique+continu+lyc%C3%A9e+pdfPDF link annotation
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/348992d9d597a9fd0145b031b8843d38/jabazivenosajuwigub.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_off0000cabc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCABC	20112 bytes
SHA-256: `89a1256988348d2e93f8922603c0c207f8ba6c4d1591172915477f7ce31cd25b`
`font_01_sfnt_off0000fdb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDB4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000115cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115CB	10916 bytes
SHA-256: `3d7527173a7debb60113bbc3e241b424fbfd660c970ee03397f7a5878a49add1`

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