Malicious PDF — malware analysis report

Static analysis result for SHA-256 1732865aca579dd9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 05:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c576b641287756b3d283f7b1a5986b11 SHA-1: da6287a8c03ff05c3b7f020830907355bca712ea SHA-256: 1732865aca579dd9bcf8412adc6e39fd13ce160f71a1f53c4d934beae83bf28e
136 Risk Score

Malware Insights

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

The ML classifier and the 'Clipboard command execution lure' heuristic strongly indicate malicious intent. The document likely aims to deceive the user into executing commands via copy-pasting, potentially downloading and running a secondary payload. Numerous URLs hosted on compromised or disposable domains suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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://pistant.ru/uplcv?utm_term=find+x+in+a+matrix+calculator PDF link annotation
    • http://spadhotel.com/basefile/spadhotelcom/files/futilofedano.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/88260979153.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/temovarujifuvidebafusuba.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2fcc33423---wuripupuzizog.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/98125374649.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/62269314150.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/69047751661.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161447299d9c6b---84467718702.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/raxefuz.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/728432679.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/21229840294.pdfIn PDF document text
    • https://almavilag.hu/files/files/wojogaxinirutemewanugega.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210909_125344.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0ded50e22c9db61d0312863a7b25b669/tidoxomidabejoxukefulirud.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d9e52c85d---lonis.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/fovuxix.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc767e1fa---jakegilufigabo.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/35547102220.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/fabijed.pdfIn PDF document text
    • http://guitarenko.fr/img/files/vozobi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c167975ee---19907616410.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/83737682399.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/25162318668.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/sutubivutuwagevot.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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 10408 bytes
SHA-256: a41bf16fe03f0b84b444c9bc5e70df275e0fae8110bca1cc6be57db2d5201183
font_02_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 19200 bytes
SHA-256: 4059633deb071b9f1b2c7433c3258e4eaaeccfe841dd40f4db75fa19568a2361

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