Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3e8aa3f3091ec6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 16:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e966ff093f04380a274a5d1c41a88d02 SHA-1: bc6945445a2aface22b97e5a30a2c55bbcfb2a5a SHA-256: 0a3e8aa3f3091ec6c62054a48d472bf081f77100f5f288a63dfb623dc281f338
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious files. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the 'SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=bus+simulator+id+download PDF link annotation
    • http://omonetach.pl/foto/ilustracje/file/gewifepowexugunavapikar.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/zoxojopalokigobasewum.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/fedusukif.pdfIn PDF document text
    • https://huanghecables.com/d/files/28320964399.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/97195f73fbec7ddd9a0e5f0f3bfd47d9/57977198358.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/vujogamukapoxebisezomebi.pdfIn PDF document text
    • http://lex.tj/img/file/38222773660.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/15894075713.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/gepuk.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/xujadazubegamixibi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/38877288143.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/3507426163.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136de9cb5295---47348220615.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/xevuzegirenafinat.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puxagobifetanafamikozokur.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/29194525678.pdfIn PDF document text
    • http://slsnn.ru/content/files/foserijawunalifu.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/dudovojepava.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2c004eab1d93367ceada21d75b91ce93/legosevalusifopo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161364d281d5c0---33293534907.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/79175965632.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/74071928536.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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 17852 bytes
SHA-256: e092ee1f27f7f99e9a2092850ead84a16bc6e10266d667c2555451d1d386b831
font_01_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 10516 bytes
SHA-256: 25616149853d39bbfac75c27e9b55ad2bbb86dd288c8e99296e8874280e1f5ff
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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