Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08f34e68d51ef53…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 00:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 13aae71d378bc2f4f48d47e1d336ee22 SHA-1: 31c86e436919838d508a6d9239886f2a6db4e2eb SHA-256: a08f34e68d51ef53c570ccbf38aa45af7cae5b6b7bd8479ffc5134a58fc75ccd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by an ML classifier and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites and disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic firings indicate that the PDF is designed to host a collection of links, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=watch+original+space+jam PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4163c5a06d93b1659d82b6e7ee96d464/16974503441.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381858f4e6---14637985091.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/sozevamisezokotuw.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/27369752275.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/toromolupugogexemej.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/nabuzijutobum.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/57618910367.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/25657363501.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/vutumevikaxaporawe.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/vowosixole.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5slk8hdluhpu03re1novihff8b/5300741149.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4c97f8e4---kader.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dde7ad124179fff6c48e72a7a5d0e2aa/14370751766.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/78281828859.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/fujakixutapadaxojibasanex.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/41278864798.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/50064209157.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/68742582697.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f810da701---15328950911.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/76795565269.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/65163836083.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/mozafa.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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 10944 bytes
SHA-256: 17ff51fc1e747c31560ba1d7ba5832b101e3bb4ce9dd38da60975388cd876418
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 18880 bytes
SHA-256: bc6fa67803dc99ff61ef1b578c166f6fbb94786765c58bde0ad061df2ff27266