Malicious PDF — malware analysis report

Static analysis result for SHA-256 a721827a1e01ddc8…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 09:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3c87a8988109aa6f8ac33edb148a882c SHA-1: f99ed18c6c601d0ef6798f12e16d4cadbee6c294 SHA-256: a721827a1e01ddc8a179b15ff8fdb897b29e0ab71c3fd7eae433bea235781809
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing a browser extension or update. The presence of numerous URLs, many pointing to compromised CMS uploads or disposable hosting, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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 http://bangkoksolarpower.com/syner_upload/images/files/37342284200.pdf In PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/tojezojexemorapitunem.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a6140d0da4e---komapi.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/doperesolurawe.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2035dc2e---54671938606.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/95815797366.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/49191839381.pdfIn PDF document text
    • http://poorclarescork.ie/images/68813905607.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779162d51d2---jisekenewoxewokujuwuwed.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/tomorovadirilawugoxul.pdfIn PDF document text
    • https://dineflon.com//files/xuder.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba8e3fcfe---37442752329.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5d951bf1---46258897235.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mopixinesimovinono.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cba708d8c7d---bepibifidi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f066ce0a9---bosexexanuvaleniboxodo.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/marosufisatisaxazivivo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dfa69c9cfeb43e9904b92d9b35f1fa23/ronomenavisanaro.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912d06c2049---65896572404.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e688a305f7---76743895070.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de570f29ce---livaxegewerokejonorij.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gomovivumibava.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e137576d33---rufadosedenogosi.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/30897323228.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/bedobisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+chrome+free+for+windows+10PDF 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_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16824 bytes
SHA-256: 0c313e325cf836849e737d0d884af24f3a1957075d74d357108146beb0bc1af3
font_01_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 10904 bytes
SHA-256: 6577ed4ad3d53c22afe1f493ff7d6a9d8a38b567bd32c3b13e4bdd68fdd0f3ed

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