PDF malware analysis — malicious · 36664bc8e430adb7

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 03:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4534832fed01fea7a6feab28f5cabbd4 SHA-1: 0ea81e5e6decb3cc08db4279599758ea64afb79a SHA-256: 36664bc8e430adb7a97a01eeb02c19235bec2e0f0b213fa8fcc88ab085d8b135

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lure users to potentially harmful content or download further stages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=options+basics+pdf PDF link annotation
- http://www.armstrongre.com/files/files/30879039049.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b966a62fbc---ligove.pdfIn PDF document text
- http://eurekaelearning.com/upload/news/file/devasutixapas.pdfIn PDF document text
- https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b4c5824aa891d8f76d673af02a638960/kepusijolejijixezegi.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f3efd3fc4aaf1a501507513c3ab4174a/31346926157.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cefb01e686---vimanakodanemigebodon.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcea627717---buwivo.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/61071e3adad51d6ecf2417527807852b/22562964953.pdfIn PDF document text
- http://lnimeina.it/userfiles/files/37026029751.pdfIn PDF document text
- https://haysalon.com/public_html/userfiles/file/86559799932.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6e3b1cde---lanow.pdfIn PDF document text
- http://xinghui.co/upload/ckimg/files/202108100156388016.pdfIn PDF document text
- https://vettercycles.ch/userfiles/files/69933585088.pdfIn PDF document text
- http://engroupe.ca/aym_image/files/xoriduvavisapubupexomo.pdfIn PDF document text
- https://speak82.com/_UploadFile/Images/file/zigaboze.pdfIn PDF document text
- https://sfilatinogourmet.it/file/sefevapuvomolisusasebele.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/s4drumeouv68ssbdg6f4tqlnlv/nakenafiriwe.pdfIn PDF document text
- http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/994907410.pdfIn PDF document text
- https://instalacje-elektryczne.net/ckfinder/userfiles/files/lomenefavobugabek.pdfIn PDF document text
- https://nsck-cykelmotion.dk/userfiles/file/weriko.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6a9dad8dcf23f697aa782ff4c5f930b6/nuvofesoti.pdfIn PDF document text
- http://arcadia-fitness.es/userfiles/file/bagoradepuxobifujenodeti.pdfIn PDF document text
- http://cadeco.com/testingsites/advantage_aviation/assets/media/file/51090728590.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076984915ee0---dabel.pdfIn PDF document text
- https://jooli.ru/ckfinder/userfiles/files/6553546392.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/43af2bce9fcbd8f3c24990a85819bdfe/xazawe.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ddaf3716841ea7e72ca937c9b960dfaa/vipimotexugowefuvu.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8740fbe743---lokagigokazik.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_off0000c208.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC208	10500 bytes
SHA-256: `5d0d042400f395fe6abd28198a61277d8aab7d49035940b789af0465fcb35adb`
`font_01_sfnt_off0000d9e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9E4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f1f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1F6	16336 bytes
SHA-256: `7816b6b06f54e5e289a103d0db9bc8f5c990233a74165263b5a9515c1440a57d`

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