Malicious PDF — malware analysis report

Static analysis result for SHA-256 6784ef59f9d27f51…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 12:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ba04f5c752715bdfce990f619643fb5 SHA-1: b58a50c093cd41a3847a7479de6fd79fac57d4ed SHA-256: 6784ef59f9d27f512faa58de063c758d2498c767464aa54724adf5afcf4ff2c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tachikawa-derma.biz/ckfinder/userfiles/files/27835864570.pdf In PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/67997669400.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/96753766595.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/megekotedikupetefenon.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///banusozenosofajevij.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/subekimajetokepubet.pdfIn PDF document text
    • http://net-work.cz/data/file/xaxiv.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/lorozo.pdfIn PDF document text
    • http://gr-chem.com/upload/files/lixemofifi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf723a33d---xefowetonipipelu.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/98291812745.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/bivokufakuxo.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/17891058188.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/vafido.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/69644239282.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f48c957e0---jowisilegazisarigipumo.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/80639692699.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/jelavovinimex.pdfIn PDF document text
    • http://hongdacable.com/d/files/87255631808.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/vinetanidogidixorotele.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/92513756592.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8c776904e02d0971be994c6629974746/33732179570.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/jozakuvesovekekirozeta.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/miwevepot.pdfIn PDF document text
    • http://jsdarvin.com/files/mijeruzoluvugaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=love+story+uke+chordsPDF 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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 19220 bytes
SHA-256: a43458a85a20025ac46ba0090a60903e81abc2b7ea1c282e7a3dae86580fdb4c
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 10392 bytes
SHA-256: f76e3c62646b7e9fef2245e14cdc150b25412a9f12da4d22b1aa9a24acbd7662
font_02_sfnt_off00012606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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