Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ca376d4724034f…

MALICIOUS

PDF

93.7 KB Created: 2021-08-10 14:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f856e7c889d9eda3219c0afb3f67c31 SHA-1: e0d6011724e73f725980481f03c039644339965d SHA-256: c7ca376d4724034f42a4cf9d650ebf5241695b34b6d3000880b840917d19a8d3
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's primary purpose is to trick the user into installing a fake browser extension or update. The document contains numerous links to compromised WordPress sites and disposable hosting, likely serving as a distribution point for malicious payloads. No scripts were extracted, but the overall structure and heuristics point to a phishing and malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=linux+os+that+can+run+android+apps PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160892c5d6f8ad---40370688856.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sovagasavig.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/34853178354.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712735f2d2---93118525680.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/78182488981.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/25088690711.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/81061718520.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/khp09dupm161ttaff4mqvq447c/4743972951.pdfIn PDF document text
    • http://bio86.fr/fichiers/51397887304.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/27613898087.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ee4028f3---dejasoziloge.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/bazomowinedoxojut.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/wukone.pdfIn PDF document text
    • http://grupophi.es/uploads/files/dibulikufelozeduxilu.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/zutobitabarejagujijejosal.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/jodetopidaxetav.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b751e94f---92060253394.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/638e9bcee76316ac64c3e52d57e1d2ad/xoxat.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/merazin.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/1371270946.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/62386319726.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_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 18500 bytes
SHA-256: fa5260ca3eb0c076e8673988825c7a05eb5746bd75b0f66a2ff56bb9a282db8c
font_02_sfnt_off00014ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED1 10592 bytes
SHA-256: 4cd6e0b66d8835493d14078416d15ad2e6e00d82dda24f02aa9e995c26e3275a

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