PDF malware analysis — malicious · 2159bd6829f60149

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 01:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 9d811051fd56abcddd4a26c2797379f4 SHA-1: eddcf70a04cf8d8f6d826507a2f9cb248e8f4e3b SHA-256: 2159bd6829f60149d7e95b896f809afcb738ed49c8c5dd5fc4c337b48badf367

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://wastran.ru/uplcv?utm_term=snakes+eggs+or+live+birth PDF link annotation
- http://mfahk.com/upload/files/16724950113.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6370889c1---wavajovezulon.pdfIn PDF document text
- http://elsekmont.eu/userfiles/file/vozomuwolami.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e8d7b749a---nuseba.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/04e1a2478c03fd5d947517d58535bf2c/lubelebazopetilakafukoris.pdfIn PDF document text
- http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/54896366971.pdfIn PDF document text
- http://bezagsecurity.cz/userfiles/60073312854.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/adc532d998da68390617e131a8e7e3c4/kuduxivipopanigosovag.pdfIn PDF document text
- https://rabudiagnostic.com/userfiles/files/dunijulagulasiguj.pdfIn PDF document text
- http://hzbmsj.net/images/upload/File/rozuw.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e01d37dd---nomodu.pdfIn PDF document text
- http://thefjordbaklawfirm.com/clients/876731/File/nasazit.pdfIn PDF document text
- http://murphysbeads.com/clients/54316/File/50824650570.pdfIn PDF document text
- https://allmassage.net/upload/file/20210510091616.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5de82k1cvlid7itqa531mpcnpj/80090998426.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0ead5e033---gezoniwagomarune.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bec1d20ca---wuxovovexofise.pdfIn PDF document text
- http://mdc.ir/ckfinder/userfiles/files/77746149473.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5c49ae2b---lumemub.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/48996512932.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f07a75726062fa621be07415489c2ee8/wobaloramidibinuge.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dc66dc1cfed7c6ebe9dafb685835a717/nejadapimutuwonus.pdfIn PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/32347396114.pdfIn PDF document text
- https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/ac93a6cd95c83f9124ccab99d04e3135/bewilizopebodufubuj.pdfIn PDF document text
- http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/35762187129.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9abe3bf5---11210499154.pdfIn PDF document text
- http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/40595706477.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e870.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE870	10760 bytes
SHA-256: `0a7880e5f9e96d383f5f9817560f9b30eb64df0e3b0429a62ea4d86e621e21b6`
`font_01_sfnt_off00010122.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10122	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011934.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11934	17688 bytes
SHA-256: `354e906097146fd505c22abec1f0eaad75a1ee1d26d1ce7e6ee53b9ce15ff65f`

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