Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0f406d6791357a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 12:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e230d6d1bde96cce1519a4517085b041 SHA-1: 491e1b017dd05e79afe762d181e59ff717261015 SHA-256: ec0f406d6791357a0ae295d35b02a8601e6a2d2688cfb58dbdecc6738755884f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic firings indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. This suggests the document is designed to lure users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=ancestry+guide+pathfinder+2e+pdf PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb06271a84---pawugalaxerowuzivugi.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/54564156356.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/61907041726.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/nagisesopotolavexodixofuf.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405ebd0967d---30009165440.pdfIn PDF document text
    • http://hueide.com/upload/files/95888406292.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63099346045.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210921_010530.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/bixitoropiduroruruw.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/bowarujoritojoxulovulato.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/87681500626.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/xorixenevesu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/nupumuzobizogijife.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/advlp5t99461hvitd5nt26plvd/fosarines.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/besixujigiletop.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/rewezasexuvimow.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/66341e7d6da068cbe20a1e922a59e0b1/winagokef.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/67347285747.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/53207855865.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/pujefezo.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/42340170879.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_off0000b047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB047 11048 bytes
SHA-256: a7981b5a9f81fec9b7e88587ca5011520749bf912b58c5aab629cdfbc55c7c67
font_01_sfnt_off0000c9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 14536 bytes
SHA-256: c2673472cc13e3c1cc5c0e79634df322038e5f20742954c3c8a13d5aa35ebb39