Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3790c5f64f3662…

MALICIOUS

PDF

81.9 KB Created: 2021-10-08 22:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 74aafe19bbaacb80a2b4f0b8af1f0813 SHA-1: 750dd98f558fa3cfa6487275edc4ebe25b58e67e SHA-256: bf3790c5f64f366236a2e2b8c21cb21643c51ed42815594e3310f2ed289d28b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thanaclusterwestgate.leaddeehub.com/userfiles/files/25907759087.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fd0c4ec1f8---98063996176.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147aaf1c00a8---58057365253.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566c62fc18---firawofifumot.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1633425781dawezotugatojaravonuzi.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/xudivimuwamutofo.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/15592641602.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/81495836800.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lifisigavuzimilad.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/82469264175.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/zoxup.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/41059033968.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/nixorew.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/8726989139.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/xumituvixaripoxijimovigi.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/bodijaf.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/jubidukulapinemekexudiki.pdfIn PDF document text
    • https://stopserv.ru/files/file/92899944509.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/41994585306.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/digasurivifulosik.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/zidowamulasukojerevefep.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/fugikov.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/ribagewamikodafuditi.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/71640890717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=attorney+of+recordPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/ladanov.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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 18712 bytes
SHA-256: 5eaf0a061709f0cf12d6bda13b5a74f566c12d043bb265ac3d10b6be78041a84
font_02_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 10096 bytes
SHA-256: 51873478f58739a5f5aec1f3d6343385663a8c3abd533dd7155a37d6d68e8c92