Malicious PDF — malware analysis report

Static analysis result for SHA-256 368b3cb427ce941d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 14:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15d8419250d0cd5cb597ae1ce46f8e16 SHA-1: 137c0241840aec9a1db1ce25c61c6323214c25d4 SHA-256: 368b3cb427ce941d3cb23a238c93d79c66e5c65f095a1603a2ae7f0514cda12c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports this assessment. While no scripts were extracted, the structure and URL distribution suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=unblocked+games+gta+5 PDF link annotation
    • http://cerritos.songhakbbq.com/uploads/files/92112113096.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/92617014865.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0o88n9sca9jt6c96175b330n99/24326190178.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/kojawunawukuwevamibuvej.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/11561528609.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/5932320278.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/vomapulovoluwadiki.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/84066892164.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/64323806621.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/43358474550.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/877314060.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/nevorigisuxopefe.pdfIn PDF document text
    • https://akemi.ro/hirek/file/dazepifoxevepapebufu.pdfIn PDF document text
    • http://infosierra.es/images/editor/69460626011.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jopobafefuwup.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/6177253925.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sqafe7sgoqimtfot1hj5c79hno/pujefagodawigitaninuwat.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/pifopadiludonopisuropi.pdfIn PDF document text
    • https://koratspring.com/upload/file/dolorekow.pdfIn PDF document text
    • http://sjhtractor.com/d/files/bajezozeji.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/nuteruvimag.pdfIn PDF document text
    • https://angkalaris.com/contents/files/6234909356.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141384445af1---93305485360.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/latanisulodozetetomakem.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.

FilenameKindSourceSize
font_00_sfnt_off0000b18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18A 14328 bytes
SHA-256: f863e7cc4fd084a6ba6436dd787e87de42a978138b028c17ed5952f609d62d6d
font_01_sfnt_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 10892 bytes
SHA-256: c2ea8addbb6e7cda5871957a544e9b78604da8c7e1c4d215f26b6b7b9118ec88
font_02_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1