PDF malware analysis — malicious · 621b9ba17c55e399

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 08:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6304aae42f891a6920d2ddac0f87dce1 SHA-1: 4d91cdcc0337dba4371a35e58deb582a81c7e7ed SHA-256: 621b9ba17c55e39921f6213261a4474d0d1e23bbb99271fecb038ab5071b3179

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm or SEO spamming operation. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous links is consistent with distributing malicious payloads or manipulating search engine rankings. No scripts were extracted, but the overall pattern suggests an attempt to lure users to external, potentially malicious, content.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f0f622a55c5cd6275220ff9860b5e8eb/20066177478.pdf In PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/738d2aac5a161fcc010b405590f1e7a2/63898212929.pdfIn PDF document text
- http://sbsinternationalschool.org/sbsisnew/userfiles/file/gikewitobagof.pdfIn PDF document text
- http://vistobrasil.net/uploads/file/larizelafajimukubivew.pdfIn PDF document text
- http://j-line.ca/fck_upload/file/30486063741.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b832a6c715---31373080216.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0643bca9e5---maladebozavejamevajofagu.pdfIn PDF document text
- http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/95835697311.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/89c6d6a6c87decdcf75f323241629f9b/jegipezisukowidejepad.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b3463c5e---fitujira.pdfIn PDF document text
- http://atletika-pardubice.cz/files/file/3680117496.pdfIn PDF document text
- https://cncostruzioni.com/userfiles/file/rimikesovatojesi.pdfIn PDF document text
- http://arohitourandtravels.com/userfiles/file/68974722017.pdfIn PDF document text
- http://linker-apps.com/files/72956354199.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1oqqfvc7d5mq447upb9k4jubvb/747266607.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ca8310522c4ba15507512f358720891a/gaditojuni.pdfIn PDF document text
- http://ccadl.com/files/20210831124540.pdfIn PDF document text
- http://www.oiseaubleu-promo.fr/userfiles/file/55900710812.pdfIn PDF document text
- http://abnicum.ru/files/file/fijulugoju.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0e952bfd6e91f2c28a8275805cf05c13/texasadexumitanebuvakuvi.pdfIn PDF document text
- https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1f62d0c93e82da2f6af054f687ffe6ad/88610900350.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fa6f3901---welerazatorewugel.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/87bd5a0a8205cd92f686bd534fc0dd34/21627066891.pdfIn PDF document text
- http://mamaskitchenorder.com/uploads/files/68999714777.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b436ef447---lefomesexebejuv.pdfIn PDF document text
- https://mytekas.com/UserFiles/file/dusaxefawopobevava.pdfIn PDF document text
- https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/0527141065864d8ec53921bfa9add334/37079949193.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=promoting+gender+equality+in+education+pdfPDF 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_off0000db52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f364.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF364	17144 bytes
SHA-256: `431b68c4498ef23bc49a6ebb4a055c03f65f295e6739706d2b50989b099409cc`
`font_02_sfnt_off00011f9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F9B	11156 bytes
SHA-256: `848271810f894a57aafe2dd68aeda21b576641a0a03bc5c1c0f9e84a9d9e4d00`

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