PDF malware analysis — malicious · dc09060f8c4419d7

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 07:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 40b8adddd08d9daa4fc00512d0d0f13a SHA-1: 87f74d807768f338db3c10cbd259f68bcc4792a8 SHA-256: dc09060f8c4419d70960a9f7da06bb4ae3c42b9d194ee3244114e0244cf7fd53

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://garglob.ru/uplcv?utm_term=fast+and+furious+9+the+fast+saga+full+movie+download PDF link annotation
- https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01755ea49556f5540cbdf34d09a56a67/91244004417.pdfIn PDF document text
- http://okeefesreef.com/ckfinder/userfiles/files/ralexunudanira.pdfIn PDF document text
- https://ht-cooling-j3t.com/contents/files/xetiled.pdfIn PDF document text
- http://sibinetweek.ru/userfiles/file/77460141675.pdfIn PDF document text
- http://xiaohecollege.com/d/files/94037832840.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gq4pubhubc771u6qdeiksfgmu5/81725952383.pdfIn PDF document text
- http://daydreamspin.com/userfiles/file/velefuvumivefuz.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9db2f152668da8cd17d7e2b02d2a7265/10890724453.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/575dafef564acdc936bd6d663d4cf973/gisotiguvusis.pdfIn PDF document text
- https://equipelec.fr/ckfinder/userfiles/files/wexinamaxonigewolid.pdfIn PDF document text
- http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/winizar.pdfIn PDF document text
- http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/15674209378.pdfIn PDF document text
- http://oaklandscreche.ie/userfiles/files/riragenolibawasoja.pdfIn PDF document text
- http://africanhairbraidingsalon.com/userfiles/file/15205915979.pdfIn PDF document text
- http://xahscw.com/userfiles/file/mutasoreneduwatirirubu.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a05beb817d0ec357b057d7c28153ebb6/9199659714.pdfIn PDF document text
- https://coopinproject.eu/ckfinder/userfiles/files/pegatadizegu.pdfIn PDF document text
- http://amphorabeautyclub.com/campannas/file/jalerowuwelasegitezikani.pdfIn PDF document text
- http://bhs1966maui.com/clients/64750/File/xodasenejis.pdfIn PDF document text
- https://almuhja.ps/ckfinder/userfiles/files/fogojiguwozovesox.pdfIn PDF document text
- https://juegosinflablesarizona.com/files/davoteximenenuzo.pdfIn PDF document text
- http://technoauto.jp/js/upload/files/46441196615.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7f8edacb---44084273469.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_off0000f38a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF38A	11196 bytes
SHA-256: `9e01a76e3a29b54f486f3162b1d92538008017d6ccdf0aa81c0a1f6e9c7dec17`
`font_01_sfnt_off00010d6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D6B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001257d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1257D	18300 bytes
SHA-256: `d4c4cb5a6bbe669f6d89b916db4ba3b300578e218c878900c6c474b443d85e34`

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