PDF malware analysis — malicious · 7159e997898832a6

MALICIOUS

PDF

93.9 KB Created: 2021-08-12 23:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 2c586c8e57c52f334843fccc50844ad9 SHA-1: a78072bf061378cdbbc390a9f88e9d8c3a46d7c4 SHA-256: 7159e997898832a6aff28c9929933600db6c7471456f8a46d39ed863f4a728cb

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to manipulate search engine results or distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9653

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 http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/lfsg9eovdd7k24jvu5p63r70g9/fajezebo.pdf In PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a915e45a1c4---bepekeselivizaf.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-7-22/20210722212146884775.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/29ecd8616da499b3940aa1d2ee1a61ef/86065662749.pdfIn PDF document text
- http://mashtalkandil.com/userfiles/file/56569177492.pdfIn PDF document text
- http://zpkprzemysl.pl/ckfinder/userfiles/files/33487625816.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ede3e63ecfc---zutiwikon.pdfIn PDF document text
- http://osteriailgalloelinnamorata.com/userfiles/files/bawojukivut.pdfIn PDF document text
- https://nothingbutsafetyglasses.com/userfiles/file/27873335096.pdfIn PDF document text
- http://fobas.cz/userfiles/file/33729973931.pdfIn PDF document text
- http://zaintik.org/files/galeria/files/gixejikemife.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b489fb9352---xawusinexukaduwibav.pdfIn PDF document text
- https://asi-filter.pl/files/file/16172078640.pdfIn PDF document text
- http://tetrafluoro.com/upload/files/nopevelefagisu.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4285a7597f144eee59f87ffb4c161003/tovagorelesokutasufu.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ba5ea1321faaaba1e0ed822983cab802/29908290096.pdfIn PDF document text
- http://americanpetrochemicals.com/customers/CMS-IMAGES/file/82653485236.pdfIn PDF document text
- http://twothirdsmajority.us/clients/38522/File/pojuvuzupisera.pdfIn PDF document text
- http://firmykominkowe.pl/Obrazki/edytor/file/60067515179.pdfIn PDF document text
- https://neksav.com/upload/ckfinder/files/najewikiz.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608284434b28e---99638639140.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071a85db98d4---segejulimuginuwuraravatij.pdfIn PDF document text
- http://trustycctv.com/ckfinder/userfiles/files/tumetasizos.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b554902ad883b4bccbe65fc7303559c2/sakagodigesor.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f88ab9a9---jekaralire.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2da9a09f---48859325295.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=first+act+discovery+guitar+strings+walmartPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000efed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFED	17944 bytes
SHA-256: `fcdcbb396091ea960410cf57bb751a4b3b448a22cbaec5a402e301776a97ed8b`
`font_01_sfnt_off00011e8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E8E	16204 bytes
SHA-256: `2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489`
`font_02_sfnt_off00013441.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13441	11056 bytes
SHA-256: `47222db13ed7b0cfc2138c42ec9815246f73cde3266f0e0e28a5263da7a14dee`
`font_03_sfnt_off00014de1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14DE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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