Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6f1de519c05fa0…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 22:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 99986b411819be182cdd9cd20eef1672 SHA-1: 08bf6f3c02ac6e9b18dc02c9c4be614e518a8cc0 SHA-256: ec6f1de519c05fa03b981509ba458e7581955d94ef6dad5dbcd7bbb6e0dc28de
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links and the heuristic firings related to link farms and compromised uploads indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://alternativi.brtim.com/uploads/wysiwyg/files/salow.pdf In PDF document text
    • http://miyagi.chi-kara.net/Upload/files/mogilejeremunizilu.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/84227532805.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/21706291618.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8c86debcad4b692c0eaf1696dd7e63bd/doniwilufikov.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/85510502064.pdfIn PDF document text
    • http://beijingteye.com/upload/files/jafaminubolero.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210904/files/20210904043551.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/tolav.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631958649.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614422284a39a---foxuxikomokezoteja.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1150d6d32---wulefodelenikar.pdfIn PDF document text
    • http://szm.hu/userfiles/file/ralebojabozomemev.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zifewat.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210919053538.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/nigakitevolalafupujefive.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/51261418487.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/25596909964.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/xatogija.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/fakufedibevufikujimiwa.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/kosanuxuxajunakat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+panda+game+booster+freePDF link annotation
    • 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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 14632 bytes
SHA-256: c7cd129d354006e0e5dcd8ea9ae81627e367d411b3537275cbd6c9ff97fcf346
font_02_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 10976 bytes
SHA-256: f2495f9ed9c4276acf42649c873862fab037806d2a6a8b55a691570494f153a4