PDF malware analysis — malicious · c7454582fcf3f41d

MALICIOUS

PDF

76.8 KB Created: 2021-08-04 20:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: fd343dca64090ff750cfc34379be83c3 SHA-1: b0babf9bb1754e9bde372bdb1d3dfed75548322b SHA-256: c7454582fcf3f41d740ef974d1cf0c118b9227c54bb1a39fee6784c768e78f3f

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 are part of a link farm hosted on disposable domains. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest a malicious document designed to redirect users to potentially harmful content or exploit compromised infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da0c0266d---41000896663.pdf In PDF document text
- http://zae.me/datafiles/file/zenobekawimas.pdfIn PDF document text
- http://africa-emergence2019.com/userfiles/file/roninepofinarururarogox.pdfIn PDF document text
- http://alemotta.com/resources/original/file/23480413017.pdfIn PDF document text
- http://appartenvue.net/appart/upload/images/verulo.pdfIn PDF document text
- http://dansensvenner.dk/imagesfile///depepupemifenasinupojo.pdfIn PDF document text
- http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/60689113933.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/89aa7b373387c705ce2917f3e6b5c6e8/22304214269.pdfIn PDF document text
- https://oglethorpeclub.org/~oglethor/UserFiles/file/3914976723.pdfIn PDF document text
- https://shen-su.eu/gfx/userfiles/files/tuwulikufibuminivubodab.pdfIn PDF document text
- https://arnetbilgisayar.com/upload/ckfinder/files/bojanuruvitemexovekevoduk.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/dc511f926a4a10f61db51d11cf020b24/51726288256.pdfIn PDF document text
- http://iltorg.ru/upload/file/79748899247.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609731c2e0337---74145313059.pdfIn PDF document text
- http://hytechplus.com/userfiles/file/lorinomosiramifawi.pdfIn PDF document text
- http://casier-a-bouteilles.fr/file/disoto.pdfIn PDF document text
- https://www.adoz.cz/ckfinder/userfiles/files/17286457135.pdfIn PDF document text
- https://www.almuhja.com/ckfinder/userfiles/files/53870640321.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64404221b5---18232167655.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9f3755d4---19547005368.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/40da5c6a43a737986a36a88e3727acc1/paduwokuxufa.pdfIn PDF document text
- https://butterfly-propertymanagement.com/userfiles/file/81790418211.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/43a3e81a49c7bf22a0e6e3ed97c784d0/xukuxewademetipuriniwo.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c580e387ff5---2619945026.pdfIn PDF document text
- http://3bbb.fr/ckeditor/upload/files/zusujeboxozodijereno.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+fill+non+employment+certificate+samplePDF link annotation
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1ef693d5757318a98c5749a07d3a1455/98266333069.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_off0000ca99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA99	15696 bytes
SHA-256: `bd5747c9939d224ddaabb1046b0ccb27dee128f7a97a24023d5fc69dcb51f9c1`
`font_01_sfnt_off0000f2dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2DC	10832 bytes
SHA-256: `3fb969dfa8d9f6b35dcf9ca9f75df33a05b185a5db17436df94d1554878f024c`
`font_02_sfnt_off00010bda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BDA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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