PDF malware analysis — malicious · fb5c22c7e20cd956

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 00:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 92327b2fae492255293cd13eabf8b43f SHA-1: 2a30ec8534e667924214b118bba17e4f0d5dc99c SHA-256: fb5c22c7e20cd9564a0bff2c905ea5c75d0ff70c460459fc232a93c3ceeb44d0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic findings confirm its nature as a link farm on potentially compromised infrastructure. The primary attack pattern observed is the use of a malicious document as a lure, likely delivered via spearphishing, to redirect users to potentially harmful sites.

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://philabc.ru/uplcv?utm_term=fisiologia+de+la+percepcion+del+color+pdf PDF link annotation
- http://technoculture.cz/admin/upload/file/5486239239.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7674a766a369cabf7723dbeab937b571/25808504540.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c204b4803f2d2e1107bad199b5102206/marafa.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1at832s0ithhnb8qfdm846c20m/44522183280.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4fd436b06db0b92f043791cbd8718c96/88502711621.pdfIn PDF document text
- http://orderkai.com/uploads/files/wunegureneru.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ee4fdf6cfaaa3efc5702a45bab426476/dexujome.pdfIn PDF document text
- http://drapa-technika.cz/UserFiles/File/nibageruzozoxorovonujiza.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d46c9e28705---51992530340.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ba92b90d---94749699025.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c73ead026---78787867637.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43502a9676---belinuzinujobuwe.pdfIn PDF document text
- http://makinsushi.com/uploads/files/55038731299.pdfIn PDF document text
- https://meesens.be/KrMee/Tekstverwerker/82403264723.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed2607187---wodukibivup.pdfIn PDF document text
- http://rowsontw.com/shopadmin/upload/files/rovafasa.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082129165daa---fubitikukoreb.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d4dafc53---23566934862.pdfIn PDF document text
- https://2acontractor.it/images/file/30751551021.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111a2e787642---pubasefeweneditemedovara.pdfIn PDF document text
- https://michelbarbot.com/upload/files/burisuripamezatab.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/6095251254.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbaf840c12---xesiton.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5e534d1addc53eef4d4105b2b6cd8ab3/diwatanuki.pdfIn PDF document text
- https://larustt.com/upload/ckfinder/files/vupop.pdfIn PDF document text
- http://gleneaglehoa.org/images/file/gorinaduki.pdfIn PDF document text
- http://veterinariacasettamattei.it/userfiles/files/xanikigadezotub.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_off0000d64d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD64D	10676 bytes
SHA-256: `25b29f00d6ff7ad3b71a5bbd7312c8e6c24c5b0ea99b7e0935d3f8bff99eb345`
`font_01_sfnt_off0000ee9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE9C	18912 bytes
SHA-256: `831025c19f2f20a494f5867e4a46f1e24a3ca72f5f12dbf05dcc05139f68aff8`
`font_02_sfnt_off00011df5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DF5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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