Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f46c2e67b8cbfd4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-14 14:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8478e5e9014a37ec49b0647ea7daf887 SHA-1: 76187b50d84ccb04e5ff7e6c31bfd8c8309a1c7d SHA-256: 8f46c2e67b8cbfd4145fdfc11625cf697fa5cd7680c9b43abe22e762e8971372
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chiangmaicharmingtravel.com/ckfinder/userfiles/files/11858071029.pdf In PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/74222133226.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/65325215689.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/2635957392.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/povarubewitobepaxudumavet.pdfIn PDF document text
    • http://m2m2design.com/userfiles/27411826143.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/50789252379.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132588a98f19---93127052307.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139d062c3648---66450052353.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xunifexat.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd0481485---61436084958.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1c2a875a---pemosebabameluwosuxed.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905174511.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/nigumipoxurevomikesofi.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/daperodowu.pdfIn PDF document text
    • http://planbmedia.hu/files/12625339886.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/kijuzegetalofifagofijopaw.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/70461788795.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/pokirinez.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/14658731777.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/42655782938.pdfIn PDF document text
    • https://areicon.com/images/file/wefizofagelawalitaki.pdfIn PDF document text
    • http://ombs.ru/uploads/files/visure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+3+free+for+androidPDF 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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 17436 bytes
SHA-256: 3e5248c1b71cae049305f7ead586054b34ded17c9f64c6f68322738d260a7e69
font_01_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 10344 bytes
SHA-256: e25c0dfa56c2494ee0fd8de059970162dd1bc08f34aca85792db0274a03d5d3b
font_02_sfnt_off00013460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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