Malicious PDF — malware analysis report

Static analysis result for SHA-256 35512b76953f0e33…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 17:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d0c4c38563fe1ec0f3ef2f64b3da51c SHA-1: e4a69140e7d40f7a0d7ffe7259085537dc8b9fbf SHA-256: 35512b76953f0e332ece2ba901236fcbe0a3d8b048ea07eaa8a6609894fe70b9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier as malicious and also detected by ClamAV. The heuristics indicate it contains a link farm hosted on compromised CMS uploads and attempts to lure the user into executing commands via the clipboard. This suggests a phishing or social engineering attack, likely as a spearphishing attachment, aiming to trick the user into downloading and executing a secondary payload.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://elbag.net/wp-content/plugins/super-forms/uploads/php/files/1efe6b91c24e3d926b84304ac7ec69cd/vekenenubomedefis.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4be5e774f---mufuruwigeronijuvewun.pdfIn PDF document text
    • https://rosycaffe.com/file/16362073576.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c330b00dd4---20347673373.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/14026243844.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc108939e---1955840220.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/zewaburuf.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/minesobaranedimif.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/76848606817.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210619030740.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160915ad12d77c---17322689253.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/xesotawaxesefi.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/66560958331.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/biboluvimijarutajagukop.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ga6939713dkaortdmfp6lhq06q/bixet.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/53770647025.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/19997673264.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160788c3137838---1482862288.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3a3a5fc3b---foxazulumijiluloj.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/tasenikojilumopakepe.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e2dbd6c4---lidedarivewiduvob.pdfIn PDF document text
    • http://euro-ex.com/68044911123.pdfIn PDF document text
    • https://bloomeng.com/uploads/xavolexipoxagut.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/surebenijudujanofararo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=google+feud+game+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_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10732 bytes
SHA-256: fc213ac1afcb44b6f43900d716b452bf6b7a104c429cd652e6c4f4afd9a76e84
font_01_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 18736 bytes
SHA-256: a966dd2ebf2bd9e9803699a2db615688a4240f0408937389a438504851eaffc9

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