Malicious PDF — malware analysis report

Static analysis result for SHA-256 a773ca3c3b1ac87e…

MALICIOUS

PDF

91.2 KB Created: 2021-09-08 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9beb67ba9a6f48a649c159cc93820601 SHA-1: d8a7d2372bfae57dba9f1131d5b001dc206723c3 SHA-256: a773ca3c3b1ac87e862dc605770b90187901725c2b7df5c5ff64076d32283b91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to exploit users or redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kovofilm.cz/userfiles/file/watezu.pdf In PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/9894313730.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/59307047302.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/bejusimafowuworuwolopet.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613879ce30a3a---59440657138.pdfIn PDF document text
    • http://korytnica.net/data/files/2124697332.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613484416dcb2---73377050906.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/83661026307.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613318ef4ecaa---23342991222.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0e5a8f31d5713e969d8433eb9e2f09f0/86795001344.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/dezidivowen.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613848eb21ae8---sererodubepinuteneso.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/mumexinidazujatavoxogel.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/38131122638.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/18581487939.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4a61a05f---sabisig.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/66928597182.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/14733586782.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/46548232513.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bdc045ecee880721598abaa80c11eca6/21070047264.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/luwalerulisitedusilefilum.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/numowijoferetaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=project+based+learning+for+esl+students+pdfPDF 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_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 11168 bytes
SHA-256: 76b94c8ce1395ab41e738765671b2326c63c130b05a620817e3d54604c725f0c
font_01_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E22 18792 bytes
SHA-256: 4831cdd6536ea6b04dedcbc2462823ea67d155993ea330b89f65426c01201c6b

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