Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c9024030e3603d…

MALICIOUS

PDF

96.7 KB Created: 2021-09-01 16:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ed4c732f5f88abde9f702720e2d7ed4 SHA-1: 8a3f47c46ac4064e59b5c7da5e56fb232166173d SHA-256: f4c9024030e3603daae9a719fe00283c8b5b95081f75e413b4a704c3ef1c1a5c
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous URLs pointing to compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates a strong possibility of a business email compromise tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/luwerekelekamidowamav.pdf In PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/vijoje.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/rilulelaviwuvimukike.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/8047355007.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/719dae5caf27d1da2831c976396f725c/19274747302.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/35391151837.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/11839437190.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/wapanu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0644a255a---dibidajotopalavulex.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/bojizunade.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/wezugite.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/96389044016.pdfIn PDF document text
    • http://sbkf.org/files/files/57835561200.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizifafawip.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/55446243216.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bedirabal.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b82199c49f4---wegewakum.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/dugulokuf.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/limukevawafoxutirekokere.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/webalonudovomadul.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/69689ad02178de5ca7e1d30a5fe76af4/4846950310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hardware+networking+interview+questions+and+answersPDF 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_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 18348 bytes
SHA-256: 20f9fd4cf9d926109153cc26d76b0975ccbd7301d79bfe0eea139d609af46805
font_02_sfnt_off00015c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2E 10860 bytes
SHA-256: a79c1cac6267f4369138cca5284c05d1282b97e2a62184c9b17a3ad043794611

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