PDF malware analysis — malicious · c1a5f55be3388772

MALICIOUS

PDF

102.3 KB Created: 2021-08-09 23:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e12a0a83793f98ac1a72774777e59aac SHA-1: 3254173181fb83a546a5b34d2075983b181b7553 SHA-256: c1a5f55be3388772a3002d87de74310775fae66fbdddd958364dc92dba6be6f6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, with several pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts and UTM parameters suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the structure and heuristics point to a malicious link distribution pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://catamma.ru/uplcv?utm_term=air+france+dubai+quel+terminal PDF link annotation
- http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/58998555965.pdfIn PDF document text
- http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ab66a0d5---961395937.pdfIn PDF document text
- https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/h0eur1kfaqv9oib71bop243fe4/bufugewujujeniwazo.pdfIn PDF document text
- http://hairtransplantmangalore.com/uploaded_files/userfiles/files/koludobatiritutufidi.pdfIn PDF document text
- http://skolicka.eu/foto/images/file/97971940815.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/zifutiwerevojirilogesar.pdfIn PDF document text
- http://toeicspeaking.net/_UploadFile/Images/file/51210606845.pdfIn PDF document text
- https://dolmalatrek.com/userfiles/file/davezidogimuwebubigumike.pdfIn PDF document text
- http://longarmacademy.net/fckeditor/userfiles/file/jeluxetugetawufoto.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3928612f---saguxote.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/oht6kuipgqmt6cq15mqsbp5c70/99064559064.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c7106127---72329562446.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cfaa9f2e5---xakolamuzejikiv.pdfIn PDF document text
- https://hglobaltourb2c.com/FileData/ckfinder/files/20210728_0185B249D645DB6B.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160edd67c67c70---zirifivelejexu.pdfIn PDF document text
- http://chinhlytailieuluutru.com/media/ftp/file/nunadazime.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3424bb76---badatonugemokizizekaxas.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4ed2306d6f0fc564f40dc0d92a7d2fe1/42585653974.pdfIn PDF document text
- https://efnnma.org/files/file/watilake.pdfIn PDF document text
- http://sintjorisparochie.nl/userfiles/file/vuxanemezep.pdfIn PDF document text
- http://kondicionery-lubertsy.ru/upload_picture/file/basubabumazepuv.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c2fa8ca305b8ce56821c4b1973211729/ripefixululi.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/96c50ac3f62581289ec0e3aa2b2b6042/tazisefitugij.pdfIn PDF document text
- http://resortcrimea.com/ckfinder/userfiles/files/naxoli.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010356.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10356	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011b6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B6D	10716 bytes
SHA-256: `b59287bf56151b01c25dc58159dded55e03907565ffb94aa91e6926510efb167`
`font_02_sfnt_off000133bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133BB	25784 bytes
SHA-256: `c42986134e486e8cce90c3bb1cd93ac16b3dc03f600859613436e4ccb897d4a5`
`font_03_sfnt_off00017024.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17024	17124 bytes
SHA-256: `913217f403b5e745b5dd34a5db789146dace02d18b6cb49235b774dbfa041a42`

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