PDF malware analysis — malicious · 66ee824a4c844206

MALICIOUS

PDF

86.1 KB Created: 2021-07-18 22:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 251848027d4cb304953f6e055046cfea SHA-1: 3787f1f8608bc7820040084a3e80da2cd45a5b9d SHA-256: 66ee824a4c8442064f781d5dd7f5a9702406f91246bfbe9a6d3d46aa7b25bc74

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://grafichesirio.com/userfiles/files/zuvujowode.pdf In PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db108a04bf7---61475170619.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867489dcfc4---roguvojiveropodoge.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608189612991c---56270934759.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/087dcc0d2d329338b259dcf28fed50c5/13220892716.pdfIn PDF document text
- http://msinziniering.com/userfiles/file/77914196139.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/cbrics9icj936781nbnopljrl1/vefojafoliwabapima.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/39vcbtlp9tgrn94ir67lfsbqo2/dujumewukamologenolapov.pdfIn PDF document text
- http://esoftland.com/userfiles/file/40340504420.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2e8c3321cd6173572810c4a8e7723db4/koderajurare.pdfIn PDF document text
- http://talani.nl/userfiles/image/file/lujijuturugavezu.pdfIn PDF document text
- http://taikenplan.jp/ckfinder/userfiles/files/46385296660.pdfIn PDF document text
- https://doganagolosa.it/file/46739336786.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b4c65d4eff445215cc509b8ac26f2acc/79065222213.pdfIn PDF document text
- https://alteanetworks.fr/img/file/54777250298.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b828ff86887---detemof.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9640d289ce55da79b6c333862183833f/gofeguxederedamaju.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lk98eab1q5hma377h4patjqcm5/mikoguvonivaxotaraz.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/8ff1916aea2fe87333ae9f25d9f31e7e/7679383872.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c950987b5299cb8c416dea7b6a1452f8/65697551137.pdfIn PDF document text
- http://ankaser.com/userfiles/file/limefiwamenigadikokawon.pdfIn PDF document text
- http://www.annaleehuber.com/content_files/file/miputojalojifeguweriwuw.pdfIn PDF document text
- https://bloomeng.com/uploads/mikar.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19a01da2f---nexuxaxisawagorupewu.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/dc1cd386a2fafcf1e6c83a0ea8327d8b/9509797734.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=quality+control+does+not+apply+toPDF 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_off0000f0cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0CB	10780 bytes
SHA-256: `17a7a25968301b5fae5c5169c678fadeb4ef83c9e3b058bc9f34ba794b4a9474`
`font_01_sfnt_off000109df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109DF	16100 bytes
SHA-256: `d5a356cef3fd2b29157ae7197e180c0ac9509465dba7ccbd89f5193058411e5e`
`font_02_sfnt_off00013324.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13324	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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