PDF malware analysis — malicious · 41c570cbec3bf99b

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 11:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d27412c5a25aaca9bd0d1b0f2bb171ef SHA-1: 8048003ce7bf6b8e774c1ac58ed6f3865f6e12d8 SHA-256: 41c570cbec3bf99bc6609d57acd006083868cc8efab05926971f252f866b2144

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, specifically employing a 'browser update' or 'extension installation' pretext to trick users into downloading a malicious file. The presence of numerous links to compromised WordPress sites and disposable hosting further supports this malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a social engineering attack aimed at delivering a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e43895cb8c3---teruraf.pdf In PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155827e30f---ximifikexuse.pdfIn PDF document text
- https://amrapalispot.com/userfiles/file/53574928239.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1a665ebaa---5081371530.pdfIn PDF document text
- https://indicaperu.com/userfiles/file/77191997584.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160adbaffedb66---wepatunobozuropowanozuru.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e99845d27---49720109655.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c19c92370c24480a1f7a96e085431569/wedadabukijikemomojatiku.pdfIn PDF document text
- http://studiovalentini.eu/userfiles/files/81442017209.pdfIn PDF document text
- https://www.ftha.org/admin/ckfinder/userfiles/files/81981065655.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d42abc9283---75217501946.pdfIn PDF document text
- http://yasairamenbar.com/uploads/files/pixurotexawusani.pdfIn PDF document text
- https://agronlogistics.com/userfiles/files/vojuw.pdfIn PDF document text
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3171e588eda28ce95cda79a2edac128d/77250361547.pdfIn PDF document text
- https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8a84dbf79150b53a3e4283aa841da630/56275784834.pdfIn PDF document text
- https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/ab57c3419bb723b04e17721b08d03dfd/didujedegiw.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608023e9ae098---lezozavami.pdfIn PDF document text
- https://pt2-turbo-j3t.com/contents//files/tewutoj.pdfIn PDF document text
- http://www.koeru.eu/failid/file/35321460161.pdfIn PDF document text
- http://alfavit.tv/userfiles/file/63502983550.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7360be935---55208702688.pdfIn PDF document text
- https://skywaytravelandholidays.com/ckfinder/userfiles/files/17294539859.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4606b51dd4---suresa.pdfIn PDF document text
- https://anna-bel.com/app/webroot/files/userfiles/files/18453923625.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/7ju0djamfud8788jr8vua0ncbh/vawiresonosolorerafebuni.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610256680981f---wekofuzapul.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0af442fdcccb6cdb2b6467085ee42dc0/vukatetuwumu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=macbook+default+pdf+viewerPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e360.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE360	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fb77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB77	10816 bytes
SHA-256: `a4dcd8545c2f2dc363d34aff88510e9acee68d76687a0bd257e649d4cd82404f`
`font_02_sfnt_off0001146a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1146A	17588 bytes
SHA-256: `f087cafc91fb1f526f62964e38edf099f3a396db5e12a80d46558f653d9b62bd`

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