PDF malware analysis — malicious · e6a72890dd8baa84

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 11:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 605f67befb1291f799af93b05fdaa393 SHA-1: 834be799b8cf4c363abbb5d84c2e27080cc2d66e SHA-256: e6a72890dd8baa84a3be734c68b2d5b2e0e70126c88203a0d9d90eee9e4354ec

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm with UTM parameters, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

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 https://synerhu.ru/uplcv?utm_term=auto+manual+life+vest PDF link annotation
- http://rudolphalexander.com/uploads/files/27247555890.pdfIn PDF document text
- https://synodradomski.pl/userfiles/file/zizemusisufedibupapalajo.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f9c79d49---81774294808.pdfIn PDF document text
- https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/08e0ef54e082e17b6c2d3df4b563506e/xebifumuropad.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f1c78279---vezudum.pdfIn PDF document text
- http://palami.by/images/file/87182083859.pdfIn PDF document text
- http://esistore.be/userfiles/file/lisafoluxawa.pdfIn PDF document text
- http://cukrarnakolbaba.eu/obrazky/files/fubumilejuxepomitemux.pdfIn PDF document text
- http://naturallabs.fr/userfiles/file/19454834792.pdfIn PDF document text
- http://faurerom.com/userfiles/file/59309373421.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175ae4c2c3---78408132453.pdfIn PDF document text
- http://krzysztofmalec.pl/gfx/fck/file/41836562916.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf8a699c7---zunowi.pdfIn PDF document text
- http://parkhigh65.com/clients/4970/File/66640216194.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee0873f2f9---naxupunasupotoromadajato.pdfIn PDF document text
- https://khangle.vn/uploads/images/files/71686624220.pdfIn PDF document text
- http://lynhuagiasi.com/Images_upload/files/29125364235.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3ea4dd0faa76e1e5a71241cb090d3a65/movujotovub.pdfIn PDF document text
- https://toptenstudy.com/upload/files/BodyFile__60FB844F7B392.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/fa91d69aba9c3a10335073b6b0526d63/pozapumixulew.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/82b5f4485d323efd49df8b72e4e87314/kugoge.pdfIn PDF document text
- https://limblength-sldf.com/userfiles/file/7179940316.pdfIn PDF document text
- http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/53683050082.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16107970284bc2---xisive.pdfIn PDF document text
- https://netlandschool.cl/files/2042238508.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
`stream_003_off0000b674.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB674	18360 bytes
SHA-256: `fe6a030cce3a1e6f7bc0bd98ffaf71e5932d07356b5efb165c677cd9129ebadd`
`font_01_sfnt_off0000d2c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2C3	10420 bytes
SHA-256: `f429040a07dead85314421d0b2ad2f11f2e029056b25d698e86a23f5c0ae5eac`
`font_02_sfnt_off0000ea6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001027c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1027C	14628 bytes
SHA-256: `430f4a62159efdff6cbb80c0a48d76ed4216156462d480a11a58ca8263567379`

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