PDF malware analysis — malicious · ea63109c02814c82

MALICIOUS

PDF

86.6 KB Created: 2021-08-17 11:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 1bba1521fff896af2fd15a574853861a SHA-1: 1fcdbf715e132c8bf973e46a6956fa41545ac8d6 SHA-256: ea63109c02814c828a8b361d647e78d32b36db0120730990e8d4a9929194370c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://meadescafe.com/userfiles/file/xodorar.pdf In PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4452ff923c134d9e381effca55aa5f35/zafumaxelesegalirebelizet.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b34bf2ffc6---zodol.pdfIn PDF document text
- http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bd47e175---49979700844.pdfIn PDF document text
- http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/wuwofuzibudekimu.pdfIn PDF document text
- http://ukicda.com/admin/fckeditor_upfiles/file/2021070916485480554.pdfIn PDF document text
- http://lasfyy.com/uploadfile/file/20210813012313676.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6fee0245945c41af0016ef50fdf61d2e/30449109512.pdfIn PDF document text
- https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/nabru7a3hi3scgb9lmdmi9j30k/fanivafutajejezalul.pdfIn PDF document text
- http://blesk-stroy.ru/userfiles/files/78364201985.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/83707196686.pdfIn PDF document text
- https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/fb0106f0661603d9ca20283ff554bf61/mirija.pdfIn PDF document text
- https://bestcoloringpages.com/userfiles/file/41270921052.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c11efcc8e98---30836442831.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a83aae815---35430149092.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ulmhi217mp89ud17ps6lt2u97q/53230187008.pdfIn PDF document text
- http://creationart.hu/files/file/58901532394.pdfIn PDF document text
- http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a532c0fa---laxowulexujugotozurirovep.pdfIn PDF document text
- https://evermoral.hk/upload/file/1627459068.pdfIn PDF document text
- http://voszveszprem.hu/_user/file/livovibimomunufelifufuji.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4f75f27d---liguzapimalisuze.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/on819m2kic9qkuk12cnaemlln6/35436393747.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098f1ef30a86---bakawopulamulew.pdfIn PDF document text
- https://beldaoyun.com/calisma2/files/uploads/11672296553.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078310d4349b---53740824218.pdfIn PDF document text
- http://weddingceremoniesbybev.com/clients/72651/File/1907757574.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+bitcoin+cash+blockchain+walletPDF 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_off0000eeae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEAE	10716 bytes
SHA-256: `331b6131c6c5021023b596d3b9f5c110bf4eaed311fa0719e95186e9acac3151`
`font_01_sfnt_off00010747.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10747	16388 bytes
SHA-256: `4e643c21cf6da7ca109bb2356a7fc2d8f5ab787c3c61a9717466ec8167fb98ff`
`font_02_sfnt_off000131b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131B1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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