PDF malware analysis — malicious · f42de254d27427ef

MALICIOUS

PDF

87.7 KB Created: 2021-08-18 18:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e7d666ab436384e63e695ba745a85e37 SHA-1: 7b6381e8350226f915bacb2d4e9f3d666e6ee802 SHA-256: f42de254d27427efe3e992af52fc45c3e83b823b86c610dc2a63be25eae141c1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting an attempt to lure users through search engine optimization or by hosting links on seemingly legitimate but compromised platforms.

Machine Learning

Nyx PDF Classifier malicious score 0.9764

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 http://gumberryoleschool.com/clients/33891/File/61533826295.pdf In PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf896e554e---towivipurijeke.pdfIn PDF document text
- https://narimasu-chintai.net/jcfiles/file/22554206194.pdfIn PDF document text
- http://lltsg.com/uploadfile/file///2021080610103082.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610024f3ddc1b---kaxin.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607de49112450---xawufidatafebuvunalu.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112523f1827a---54255922895.pdfIn PDF document text
- http://gernano.eu/gfx/userfiles/files/porozaxosofakagak.pdfIn PDF document text
- http://klick-tipp.at/ckfinder/userfiles/publics/files/24012278851.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf01c5012e---demekusoti.pdfIn PDF document text
- http://www.fonfe.com/uploads/files/wusexomugeleb.pdfIn PDF document text
- http://worldcar.jp/userfiles/files/81565517099.pdfIn PDF document text
- http://rilta.net/userfiles/files/34766691921.pdfIn PDF document text
- http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16070f329ac470---vipesupurekal.pdfIn PDF document text
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/05c3570d41283a6f51ea56f173bebac3/8946218007.pdfIn PDF document text
- https://liniagdanskzydowo.pl/files/82703661920.pdfIn PDF document text
- http://vertinu.lt/ckfinder/userfiles/files/fidotomoremepujadugoremez.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bbb30f29---fegupexagesek.pdfIn PDF document text
- https://aradmissions.com/ci/userfiles/files/61773980390.pdfIn PDF document text
- http://co-wemart.com/careeruserfiles/file/3644445981.pdfIn PDF document text
- http://cellesekorea.com/ckupload/files/dofuvirotadureg.pdfIn PDF document text
- http://rc-modeller.se/images/file///mopikenozor.pdfIn PDF document text
- http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99729457964.pdfIn PDF document text
- http://yoron.net/up/files/94854569619.pdfIn PDF document text
- http://harposwebdesign.nl/app/webroot/files/userfiles/files/16573936732.pdfIn PDF document text
- https://songhong-thudo.com/img/files/nazoxa.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+rid+of+flashing+red+light+on+nec+phonePDF 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
`stream_005_off00011bde.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x11BDE	18168 bytes
SHA-256: `be26937690f6461a165847a772042ddf3e7c2187b485c561945e89bc2cc28987`
`font_00_sfnt_off0000d896.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD896	10976 bytes
SHA-256: `5bb097c7e9f3ad0aac2ad70bbf6f884035fa6bfad56908f200ebfd06dcec7adf`
`font_01_sfnt_off0000f1d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1D1	16260 bytes
SHA-256: `e634b37864848c2d67f2f57a2eb3880a813a4461a419529b1905c3a2a079fb82`
`font_03_sfnt_off0001383f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1383F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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