Malicious PDF — malware analysis report

Static analysis result for SHA-256 440b3ad43bd709bd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 04:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 621b2bd7597e81d85be41d4e35b200fd SHA-1: 173440a419afe0a88a86b80a7fb37a64ae8f5426 SHA-256: 440b3ad43bd709bd49ff5b7a965c55de19ad1a68ca2e5bd1a8a6a9069a859d3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm. The embedded JavaScript, while not fully detailed, is a common vector for malicious activity within PDFs. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://sistemagestiondpr.com/userfiles/file/49812507022.pdf In PDF document text
    • http://lightofislamonair.org/uploads/files/68021756303.pdfIn PDF document text
    • https://renewone.de/files/66247539064.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/gawabasalosi.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/vokubukuwizojanot.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210904064843_bi2457.pdfIn PDF document text
    • https://yasacompany.com/upload/files/22085126165.pdfIn PDF document text
    • http://clingac.es/d/files/sevuzovalisopazifilikuruv.pdfIn PDF document text
    • http://opsir.eu/files/file/gixagib.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/sapozeset.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/posuxesudekaxivurupafafi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141f72239e6a---32693665086.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ea0072afb8ecf193f9ec44b1ac826d9a/27141071587.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/44806671625.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/makumarowujoxoritow.pdfIn PDF document text
    • http://generaldistco.com/images/file/migadigunumivuxitanes.pdfIn PDF document text
    • https://x-software.cz/data/file/pusasoxoduvusunixideveru.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/dazubumowidabilubudivijel.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8f006296a198fdf0f743011c3ddee74e/nelujisix.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/wojanaxusesidof.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfc96ae11---81562451641.pdfIn PDF document text
    • http://lovesenergy.nl/file/94368740936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=male+reproductive+structure+of+a+flowerPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/fufalotoja.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 17816 bytes
SHA-256: 6621eb4eb3d16ed2e03e45701af3c895d42370fb9f750f6ef3170e1141969040
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 10756 bytes
SHA-256: 9b2226e5a5732bf7a0993af3dabfcad7abea40ee64d523e4885084f913f7dd51
font_02_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 17316 bytes
SHA-256: 99cec65a57ca5a4c3d7ca3527e4b1ce65bac2f01d788797a8b069698460bad49
font_03_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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