PDF malware analysis — malicious · 6f0c96a6b8ec5ea4

MALICIOUS

PDF

101.3 KB Created: 2021-07-14 09:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 347b224a91b1fcb908a32c4b558b069d SHA-1: 06c90f3fe06a0d0733cbf4be72a68a286d7f7f7f SHA-256: 6f0c96a6b8ec5ea4c56c96b4006dc69920236bcf08e1a4d54178e2b53f43b97b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially malicious content. The document's structure and numerous external links suggest an attempt to lure users to external sites for further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9682

Heuristics 5

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://fujavietnam.com/images/Download/70337140088.pdf In PDF document text
- https://mbzgogo.xyz/web/img/podborky/files/43414366627.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160974067ed71c---favukulizejo.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf3d6e2ac---vemalufoteloxabesekari.pdfIn PDF document text
- http://houselandia.ru/files/moxuj.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef59b1e86e---geker.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/561a1ce2fda003559b30d81f1ffc0091/niluro.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7083124672---12652568239.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a667db4c080e6d5b60c42b05c98fed1f/8922741194.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eb3847bb116a62984d3ccad1883ed82/dalosiwimu.pdfIn PDF document text
- https://krossi.ru/images/content/files/pelujemugapubexa.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc96d6f497---1865686572.pdfIn PDF document text
- http://cpils.com/userfiles/file/zatoxafuvebuvuxawoze.pdfIn PDF document text
- http://septumdent.com/img/userfiles/files/92909409266.pdfIn PDF document text
- https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb37b8e63---78282524211.pdfIn PDF document text
- http://hanarotalk.com/userfiles/file///38915489152.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d40ca9679---zakipurolisifoka.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af37278f0---66847874941.pdfIn PDF document text
- http://cuoredicane.it/userfiles/files/69452685495.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cbe9dddd---xogevufiwin.pdfIn PDF document text
- http://carrasvilla.es/uploads/files/40499960087.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d18b09cfd---95967088711.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083e07e7e2ec---toziwapoze.pdfIn PDF document text
- https://deniz-sogutma.org/img/userfiles/file/89229528026.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/5ik14j9m43ah3moe73jrpa4sv6/lotugaxilemamu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=clusters+and+superclustersPDF link annotation
- https://mediaget.com/userfiles/files/ramuzumonizigotovowapur.pdfIn PDF document text
- 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_off00010f88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F88	18876 bytes
SHA-256: `37b35ca32ba7e3f9d81eacdd1bcc832daa24fb4f15baf2e73f58625ddb79761e`
`font_01_sfnt_off00014153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14153	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001596a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1596A	10428 bytes
SHA-256: `f419dcb608ce74724fc99b47132ed972ffe28b2c6af2664fdf8b550f393eb776`
`font_03_sfnt_off00017133.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17133	16232 bytes
SHA-256: `338cc954a946a7fbf70b29c55d5e66db99b2ef151e94d540d22e7b387f44db23`

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