Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb9c70670a18fa9…

MALICIOUS

PDF

87.2 KB Created: 2021-08-09 21:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b97ec7d8e41e628869d560cc4628f698 SHA-1: eb01eca39658b8f9094eb170925df5b97852acec SHA-256: 9bb9c70670a18fa960690b891a31bc0466ebeccb175b17ca15f1f8201bfd1075
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The document body, though obfuscated, contains text that lures the user into executing commands, specifically instructing them to 'copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context'. This strongly suggests the intent is to facilitate the execution of a secondary payload, likely downloaded from one of the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://irlanc.ru/uplcv?utm_term=how+to+always+run+cmd+as+administrator+windows+10 PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75c3694---wiminifibubonakesusufi.pdfIn macro / runtime command snippet
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730107a0278---gixevajaravomameke.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/98129802039.pdfIn PDF document text
    • http://berbun.com/user_img/file/pemilirovuvazadolawonovi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/36281e0c799f6de648b0725da17e90ab/vawovurupujezatoja.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608628d5eee95---21782779184.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210508184551.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f231c3150---zuzopabuwada.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/tetilixikozo.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/zatunebilovorujovumisob.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2bae8730---jewogaxadipimobex.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m5ri7agjl8a39rnh06if5rd19s/lekawidibivivoxabokewexaf.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/27hkoqbdbkeq4thakhnj8152d3/zoluweritupute.pdfIn PDF document text
    • http://kalikraft.com/images/file/simubokaravodapijeki.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pmoqgl7e92bniutimodlfv5io0/kokupibowej.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dff4fe0b17---38588402251.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/furabafolo.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/38487177383.pdfIn PDF document text
    • http://www.emailposte.com/pictures/74320950403.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tawas.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160830448ab9e3---69685878324.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/61338937792.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0d911665---36078229176.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/32650078238.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_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 18172 bytes
SHA-256: 9d101256886e8cc24519f2db9bf57e1c246c2fac780c5101cbc176f54f918447
font_02_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 10864 bytes
SHA-256: c73e61c29316ad8297db5bf6f10d521ce897628c50a9b208e374090466e1efd9

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