PDF malware analysis — malicious · 3f10ffc8b133e24b

MALICIOUS

PDF

91.0 KB Created: 2021-07-06 12:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 16e31b46fbe1276e22c51fc5d645bdd4 SHA-1: 15fce6023230cab38c82a710c314fc2b722c83ca SHA-256: 3f10ffc8b133e24b5a090541a88787675bd7ac380513a8fcd7ec21fd8cb94301

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://mamnonlittlesun.com/upload/files/31493081760.pdf In PDF document text
- http://densayhongngoai.com/uploads/userfiles/file/fewamitipipaxotof.pdfIn PDF document text
- http://veterinariogiardinelli.it/userfiles/files/mazob.pdfIn PDF document text
- https://jahanchart.ir/data/files/file/34438984767.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/496ea7e643d0eac2bb2a9ac66d32e695/21424817503.pdfIn PDF document text
- http://splogservice.ru/content/files/bomomufirevogaki.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca2c44c810---77937604585.pdfIn PDF document text
- http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/56400401844.pdfIn PDF document text
- https://chiataiec.com/userfiles/Proj_Name//files/domifulibutisati.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0de19fc1---34796849742.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b06fcb77b44---netuxoxopazixibavojex.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/bifufutodozefixu.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d22995155---pozulererev.pdfIn PDF document text
- http://xiaohecollege.com/d/files/77273592931.pdfIn PDF document text
- https://curewelldiabetes.com/userfiles/file/gagarariluwa.pdfIn PDF document text
- http://cheumst.com/upload/fckeditor/file/jeboleturome.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565a66804b---84850278801.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8dcefca3---tazokiw.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077937bee423---16610481730.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6aeae7600---16618763366.pdfIn PDF document text
- https://growyourmoney.in/userfiles/files/98857554125.pdfIn PDF document text
- http://k1a.ru/images/files/file/63835352042.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/578aba12b1e965cc80dbdd7adc6e95fe/8229513637.pdfIn PDF document text
- http://www.klimavill.com//data/editorfile/jekilinufubagewetoj.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=single+phase+half+wave+ac+voltage+controllerPDF 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_off0000e7d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7D0	17856 bytes
SHA-256: `f5169b2a9998a61b9be07c866843ff7665496c8d18bd999d659a5e10f9201cf8`
`font_01_sfnt_off0001169e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1169E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012eaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EAF	16172 bytes
SHA-256: `b1bd5690beaa374b9073da8cfd0961bef7dc044fe84bbe97f8390ce5daaacaae`
`font_03_sfnt_off00014451.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14451	10984 bytes
SHA-256: `bd080bd09a5855f50237af78e721b1db91ad8ba071f91b115c5dd8ec50551d7c`

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