PDF malware analysis — malicious · 6478d55c461ff14e

MALICIOUS

PDF

88.7 KB Created: 2021-07-25 12:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 15cadc64d1ddeb7779768a2e6b2f296e SHA-1: 8b9d25b9e856dc8501300c983e1a739b36f2f51e SHA-256: 6478d55c461ff14e60997eb8b4c4620d91057f8619ea27251bca37524f7c7c22

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a link farm, with several URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a social engineering tactic to trick users into providing passwords for encrypted archives, likely to bypass gateway scanning.

Machine Learning

Nyx PDF Classifier malicious score 0.9986

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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://www.vnos.vn/app/webroot/uploads/files/60610381996.pdf In PDF document text
- http://www.hcc-cpas.com/siteuploads/editorimg/file/memogavudamobisefapobon.pdfIn PDF document text
- https://siam-royal-view.ru/data/files/povemulakefelabuxinulir.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f9bcf9e1---retevujotowijezegenuk.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d6ba0065174f9603c52ccbfe1abda0b5/9722998906.pdfIn PDF document text
- http://plafondchauffant.fr//img/user/file/22143556482.pdfIn PDF document text
- https://efnnma.org/files/file/21472475415.pdfIn PDF document text
- https://abandassociates.com/ckfinder/userfiles/files/9191784529.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d4bb70c88d1946467ff9cc6d39615e9a/44513377557.pdfIn PDF document text
- http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/34080477399.pdfIn PDF document text
- https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ame138fh7e7u050nqfo9k5jtci/11642466140.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c90aaab5238---18685859575.pdfIn PDF document text
- https://radio-aurea.eu/files/file/35844393997.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/33033514844.pdfIn PDF document text
- https://medtek.vn/storage/file/poxiv.pdfIn PDF document text
- https://dukeofmarshall.com/ckfinder/userfiles/files/wuzowulurivodogu.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a5iiodflju55ajim9gvgla14j9/lasomaw.pdfIn PDF document text
- http://motoren-adachi.com/js/upload/files/defojamagodakopegosaga.pdfIn PDF document text
- http://seabeachthailand.com/UserFiles/file/9866073013.pdfIn PDF document text
- https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c94ee07f06c0af6bd2951f0199364be/tiregeti.pdfIn PDF document text
- http://wittlich-luexem.de/userfiles/file/lusagidipimuduwifapo.pdfIn PDF document text
- http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1fee3385b3aca64cc203aa0c28d71364/jaripu.pdfIn PDF document text
- http://mid-europe-ex.com/xagavuleregiwutifore.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/477231236b1d4bdd46b8a1db46938cf1/23342210320.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=id%C3%A9e+de+mot+de+passe+compliqu%C3%A9PDF 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_off0000ef58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF58	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001076a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1076A	19844 bytes
SHA-256: `25d1653e7b24b8e8e5e7a6ece262c03347764023e7e3b0ba46d395ced4d2f23b`
`font_02_sfnt_off000139d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139D6	10820 bytes
SHA-256: `10434660819c128ea5383f36d54f91ae25b5e76a113430d9b6c6aafb6e800e6c`

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