PDF malware analysis — malicious · 42bdcd9fb52d145a

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 18:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 80737f5486e494081d8d1782d243b522 SHA-1: c9377eb7e907714248fb54ae8437a7f4b241f63b SHA-256: 42bdcd9fb52d145a5a26866296c976e3e06c2ed74e31ac841768d03293cae911

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://allytemp.ru/uplcv?utm_term=x+ray+history+pdf PDF link annotation
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5a3306fd3---gulijevapajoronasinux.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3af3641e47bcb84c0d8b33655c409968/nobixuzojotaz.pdfIn PDF document text
- http://eugensa.lt/app/webroot/uploads/userfiles/files/26857056795.pdfIn PDF document text
- http://tcsm62.org/uploads/news/file/ratitatonujosugab.pdfIn PDF document text
- http://simonide.org/userfiles/file/rapodoj.pdfIn PDF document text
- http://aiaato.com/FileData/ckfinder/files/20210624_1E4FB42586BB5B9F.pdfIn PDF document text
- https://vicotelecom.vn/static/source/images/file/93416938768.pdfIn PDF document text
- http://www.veslovani-vsb.cz/soubory/file/lijobexofimonegisavubot.pdfIn PDF document text
- https://thaiahpa.com/flash/files/kurefepibakugejit.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6941742aa---wuxejofanumi.pdfIn PDF document text
- http://altelaw.com/uploads/image/file/ziwuxuwimixiruzakeb.pdfIn PDF document text
- https://coaching-jk-academic.com/ckfinder/userfiles/files/63008476219.pdfIn PDF document text
- http://pitin-akutsu.com/js/upload/files/jowonixifij.pdfIn PDF document text
- https://salonrewards.ca/images/file/8095629632.pdfIn PDF document text
- https://khambenhxahoi115.com/images/files/85371784774.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/a86bf7fcbd80751d502661c16d765e1c/zopalapenemojolifesubof.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609be50186e39---52700356015.pdfIn PDF document text
- http://ccforum.kr/uploads/file/1621829947.pdfIn PDF document text
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/od7cckq3lka5oahq74t6otrvtv/berita.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210528124908166.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ks785ig82b56tcfa4lagoorvt4/35119310628.pdfIn PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a570aa33f8---63062925700.pdfIn PDF document text
- https://nothingbutsafetyglasses.com/userfiles/file/mawefizewoparifusalud.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/301ffed20df251929c4592623a8cc8a1/35669454667.pdfIn PDF document text
- http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11341214419.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7999828a3a---15112657442.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_off0000f535.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF535	17420 bytes
SHA-256: `c728378ecd5055caf7b79f760258be7883368d4746f82c953c5eda31289b5893`
`font_01_sfnt_off0001227a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1227A	10436 bytes
SHA-256: `b0c20410ea72e4708afad7d47c35cab39defbb129af52eb81240d7b0d17e2eff`
`font_02_sfnt_off00013a49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A49	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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