Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d8b6e7609bb2b2…

MALICIOUS

PDF

84.2 KB Created: 2021-07-03 13:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6656ad8eab73c8686284553df2b6e741 SHA-1: 2156802c8f41b53f7776e759c23cc565e20fee70 SHA-256: c2d8b6e7609bb2b2b3662e39c8f4786c6cfc7fa0f46fadae5e3488b7a51b2996
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a 'clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. The numerous embedded URLs suggest it may be part of a phishing campaign or a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=key+to+wren+and+martin+primary+school PDF link annotation
    • https://majorsagilekvaros.hu/uploads/file/kadaxujufusatudik.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8493f7b61c---89396772618.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecdd66631---67998183208.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f687661ba545e8ed438f52b0c41eb5de/wabozigupavebupulu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dd7a2f80e8b59b23e1ba3167b8cbb2b8/vumamupupedugilos.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce4f8bc1bffb1a4d38327e42fcd7c0b3/jawanudisivev.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf136ebb317---bitibepebirepewikizimu.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/bunewebajubek.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/wotafodikezapi.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///sifutorekidiveritak.pdfIn PDF document text
    • http://ttc-investco.com/img/files/10634734410.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vafamedefazamotedikemuzi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a43f365cf---47762461129.pdfIn PDF document text
    • http://usmleworkout.com/files/file/31426092548.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b56de8ea55855a1a69aa0ad4638c89b1/solelemibovano.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a4f7aaa2---namigonebusemojadiraka.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/luwoxefazodirowet.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609758bf878e8---digikenijekutiwuwoxugujew.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/dosebutav.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/28863138561.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1luvks3v44148b0n5q0341u4f4/7394215063.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7abadee86c---sapiguvukevesipeke.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210523163226.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cps7lrqk7l3soikaf5pmputn56/xetogax.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721eda5c822---30643826350.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082b34f0fad1---nesiwurid.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4966148cd0829a1ef34656765b010360/55164871508.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10968 bytes
SHA-256: 6cc5073279ff64fc727fbc9b55b426ef7b7707a26f3f2b3bb082ef0de840b455
font_02_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 17468 bytes
SHA-256: 4921db00fe6cc48080abd698985710ee91571947f30c97de4753e4e27fbb8bbd

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