Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc5308bd374bd51…

MALICIOUS

PDF

85.7 KB Created: 2021-08-18 01:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7728ccaf8a9c5198cac719cc674d15e1 SHA-1: d23a27969860281a98f4b4f76e35ef816a9488dd SHA-256: 9bc5308bd374bd519aab74f6e637c9b421cd8e9d9d3db21ebbeec7e7cc2126a8
196 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'LOLBin token sequence in document text' suggests an attempt to disguise malicious commands or URLs within the document's structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0689160739---wagutodugerimale.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9a36a605634fdec545a4951ae0dc3a53/duletavira.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dudisinador.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d47e2dc38---48016830314.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/fegelorilulixiwuxozoso.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fbro123k8289ru464hdvcb8cbb/nejagitozirosa.pdfIn PDF document text
    • https://cecprint.com/images/file/tunupanofi.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d144304a81d0354049ebaf245bd9b99c/zonilix.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/gozorasibu.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/70596304673.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34fa7d9520---relagavefudi.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/totagitasepanogarunapotul.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/girutoxiralupaxebodajulol.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/508c0c327bc3fe8942737c28e30175ef/tegumirigupita.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/54956827666.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/wemimubub.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/54620353743.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6802795c64bec2ad06308f4c4de84936/lipasezoniloposuj.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/87511271808.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/mojatagufonexe.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a2cc1db0---vevawesugofonuxa.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5lqqghf2tpq98mpqfqii2rq0e8/ladabox.pdfIn PDF document text
    • https://www.bocamviglieIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sir+william+borlase%27s+sixth+form+open+eveningPDF 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_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 11308 bytes
SHA-256: 751bb55a872101934bb6ffa89d8ada2a0bae0b11bcec1f821182f29bbc3fecd3
font_01_sfnt_off00010572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 16700 bytes
SHA-256: 3d2a972fe160cd041400924d9ec5c0940be494bd505543e814a177393a29b7ef
font_02_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1