PDF malware analysis — malicious · a1c7fc27a9465d11

MALICIOUS

PDF

97.8 KB Created: 2021-07-09 00:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: d4e06744391f8a8d095dfe499c322d37 SHA-1: c08a53ceb8f18c1c7def6b4a8c5a4d606b852db9 SHA-256: a1c7fc27a9465d11ea62648632555a1c34202ed1d92a69ed2af343d992c093e2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF download links on various domains points to a coordinated effort to host malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9895

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://irrisyst.eu/files/file/revekumaxebujefapesunuzez.pdf In PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7prc4jd9h5i03l99bfbbng11kt/71134135601.pdfIn PDF document text
- https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6e852d55f0be7b128469fe409a813a18/1412699637.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d02c1379174---loxojes.pdfIn PDF document text
- http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/68949137235.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d48d56fed---15259995472.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0581d2cc---92572216904.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jk863j7cqfctm486jmn72pcjf3/wafagetuputidosofajujud.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ujt194nbdkivbgqjn2r3issrj0/41078960489.pdfIn PDF document text
- http://arnold-sitter.com/CKEdit/upload/files/bedavenoseban.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1487dae708713a49777cbe57c84ee969/62609270938.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb1451fe02---kopotoxikapuzor.pdfIn PDF document text
- http://portaldo.eu/contenuti/upload/file/6796896401.pdfIn PDF document text
- http://cerezolorente.com/files/cerezolorente/_repo/file/buvisalirer.pdfIn PDF document text
- http://zonweringbelgie.eu/ckfinder/userfiles/files/rebapo.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ccc7e63d8c8a20f14e78ebeed80c30d0/29342487058.pdfIn PDF document text
- http://thementalhealthadvocates.org/files/userfiles/file/nowimimasesa.pdfIn PDF document text
- http://randalljroutson.com/clients/44711/File/10837455122.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9e015dbe---21682893331.pdfIn PDF document text
- https://publicbridge.pl/userfiles/file/8433571619.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c065133d849---28436988146.pdfIn PDF document text
- http://erbamedica.org/userfiles/files/gefofoxovus.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/656a2a7714ff06d04ceb93dca07be983/jiwatobudazamumanogubozol.pdfIn PDF document text
- http://acril.ru/ufiles/files/jimatuverejumuguwoge.pdfIn PDF document text
- https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dgc8h1n3kpl2kh0d68c1tja9vf/zalaxuvev.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=transformers+the+last+knight+720p+downloadPDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fcd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCD5	11376 bytes
SHA-256: `5f721d1b42f914384a153d6b1cc8d5c7bcd97b6def18deb6ea3abc2de8e020fa`
`font_01_sfnt_off00011757.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11757	19008 bytes
SHA-256: `cacb19785fc5d9cf4db615a38372e6e143ac9465d5471d3dbeb97f1b4510dbdd`
`font_02_sfnt_off00014960.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14960	16732 bytes
SHA-256: `8d839163a044c5a229aa92abbb3030be13840ad39a79f32dd9c29cff439fd2db`
`font_03_sfnt_off00016122.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16122	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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